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G-Scan Fast disk analysis tool for admins 1.16.11 971 KB

Overview

2.8 s

a full scan of a 1.82 TB drive

1,376,677

files read straight from the MFT

0.23%

from what Windows itself reports

971 KB

one executable, no runtime, no install needed

G-Scan is built for speed: it reads a whole NTFS drive straight from its master file table instead of asking Windows for folder listings. Use it the way the job asks for, on the machine in front of you or one across the network.

InterfaceA web page on your own machine. Nothing is scanned until you choose a target, and nothing calls out by itself: About asks garia.net for a newer version only when you click.
Command linegscan.com --scan C:\ --out c.json scans, writes JSON or CSV and exits with a code, for scripts and RMMs. gscan.exe "D:\data" opens the page on a scan; --ext and --find narrow the file list to certain extensions or names; --server, --agent, --show-key and --check-update do the rest.
ServiceThe agent runs as a Windows service. Open any machine that has it from your browser.
APIEvery button is one HTTP call with JSON, for automation and third-party tools.
DeploymentAn MSI with real properties for SCCM, Intune, GPO and NinjaOne, and ready-made NinjaOne scripts for a disk report, a low-space alert and CSV exports.

Scans disks, folders, WSL, network shares and Linux over SSH

C:\ D:\data WSL \\SERVER\C$ \\NAS\share user@host:/path

What you get

AdviceWhat can go, with the gigabytes attached, and what to leave alone.
ExplorerTwo panes, like Windows Explorer: a folder tree, and the contents of the open folder by size with each item’s share. Every folder level has its own colour on both sides. Driven by the keyboard.
Find filesWhere is this. Across the scans you tick, by kind — photos, video, audio, documents, archives, installers — by extension, or by name with a * in it. Nothing is read, so it lists in seconds, and asking again is nearly free: the listing is remembered per scan.
DuplicatesIn one scan or several: choose one or more kinds of file and the smallest size, same name or content alone. Confirmed by reading the files.
File typesWhich kinds of file take the space.
ExportFile types, files and advice as CSV from the page, or the whole result as JSON or CSV from the command line.
MapA zoomable treemap.
DeleteRecycle Bin by default, system paths refused, everything logged with its size. The figures follow at once: in use drops by what was freed, and what went to the Recycle Bin is shown until you empty it.

Without administrator rights it walks folders at about 175,000 files a second and reports what it could not read, instead of quietly showing less.

Screenshots

G-Scan overview of a scanned drive: size, free space and the largest findings
Overview
G-Scan advice: what can go, with the gigabytes attached, and what to leave alone
Advice
G-Scan explorer: a folder tree on the left and the contents of the open folder on the right, each folder level in its own colour
Explorer
G-Scan file types: which kinds of file take the space
File types

Examples

Scan a folder right away

gscan.exe "D:\data"

Hand it to a user without installing anything

Copy gscan.exe to their machine and let them start it. As a standard user it walks folders and reports the part it could not read; one click on Restart as administrator switches to turbo mode.

One install for the whole team, on a jump host

gscan.exe --server --token <key> --port 8443

Anyone on the network opens http://jumphost:8443/, enters the key once, and scans the host’s disks, any \\SERVER\C$, any NAS share and any Linux host, several at the same time. G-Scan does no TLS itself: keep it on a management network or put a reverse proxy in front.

An agent on a server you check every week

gscan.exe --agent --port 7777
gscan.exe --show-key

Export the file types of a folder to CSV

$gscan = "$env:ProgramFiles\GariaNetTools\G-Scan\gscan.com"
& $gscan --scan D:\data --out types.csv --what types

In a script or an RMM: scan, read the result, act on the exit code

[Console]::OutputEncoding = [Text.Encoding]::UTF8
$r = (& $gscan --scan C:\ --out -) -join "`n" | ConvertFrom-Json
if ($LASTEXITCODE -ne 0) { exit 1 }
$r.advice | Select-Object code, bytes

Use gscan.com, not gscan.exe: PowerShell does not wait for a program without a console. Exit code 0 is done, 1 the scan or writing failed (the reason is on standard error), 2 wrong arguments. The JSON is what /api/result returns, the CSV what /api/export returns. gscan.com --check-update asks garia.net for the latest version: exit code 0 up to date, 3 newer, 1 could not check.

Find every stray mailbox file on a drive

& $gscan --scan C:\ --ext ".pst .ost" --out mail.csv --what files

Or by name: --find "invoice*", where * is any run of characters, ? exactly one, a name with neither means contains, and a semicolon separates several patterns. Both drop the 50 MB threshold, so a small file is found too; the totals still count the whole drive. The same filter is Find files in the page.

Read the agent key straight into a script

$key = & "C:\Program Files\GariaNetTools\G-Scan\gscan.exe" --show-key

Install (MSI)

Install options

An MSI with real properties, so it goes out through SCCM, Intune, GPO or NinjaOne without a wrapper script. Double-clicked it is a wizard; with /qn only the properties count. Per-machine, 64-bit, and uninstalling removes the service, the firewall rule, the shortcuts, the context menu and the registry keys.

Updating does not ask for a restart, and it keeps the choices of the previous installation unless you pass others. Anything still running from the installation folder is closed first, an agent included: the service through the service manager, and an agent started by a scheduled task or an RMM is closed and then started again with the command line it had. An agent running under an account of its own is closed but not restarted, because its credentials are not the installer’s to hold. What was closed and what came back is written to HKLM\Software\Garia.Net\G-Scan\LastUpdate.

msiexec /i G-Scan-1.16.11-x64.msi /qn
msiexec /x G-Scan-1.16.11-x64.msi /qn
PropertyDefaultMeaning
INSTALLFOLDER%ProgramFiles%\GariaNetTools\G-ScanInstall location
UIPORT7666Port of the local web interface
AGENT01 installs the remote agent as a Windows service
AGENTPORT7777Port of the agent and of its firewall rule
TOKENKey for the agent; left out, the agent makes its own
CONTEXTMENU1Analyse with G-Scan on folders and drives
DESKTOPSHORTCUT0Shortcut on the desktop
ALWAYSADMIN01 always starts G-Scan as administrator
SERVICEACCOUNTAccount for the agent service; empty is LocalSystem
SERVICEPASSWORDPassword for that account; not needed for a gMSA

Everything at once

msiexec /i G-Scan-1.16.11-x64.msi /qn ^
        INSTALLFOLDER="D:\Tools\G-Scan" ^
        UIPORT=8100 AGENT=1 AGENTPORT=8101 TOKEN=<key> ^
        CONTEXTMENU=1 DESKTOPSHORTCUT=0

The setup wizard, silently

G-Scan-1.16.11-setup.exe /VERYSILENT /DIR="D:\Tools\G-Scan" /PORT=8100 /AGENTPORT=8101
G-Scan-1.16.11-setup.exe /VERYSILENT /TASKS="desktopicon,contextmenu,agent"

The web interface listens on 127.0.0.1 only, so it needs no firewall rule. The agent’s rule is inbound TCP on AGENTPORT, private profile, local subnet, and only exists with AGENT=1.

Service account

Which account the agent runs as

By default the agent service runs as LocalSystem: it always works and it can read every file. Choose anything else with one thing in mind: an agent exists to read everything, and what an account cannot read is missing from the answer.

SERVICEACCOUNTWhenPassword
(empty) → LocalSystemThe default; always worksnone
DOMAIN\svc_gscan$A fleet in AD: a gMSA in the local Administrators groupAD rotates it
DOMAIN\userWhen it has to be a named accountyours to manage
NT SERVICE\GScanAgentOnly if you grant that SID the rights yourselfnone
msiexec /i G-Scan-1.16.11-x64.msi /qn AGENT=1 SERVICEACCOUNT="CONTOSO\svc_gscan$"

The installer grants the account Log on as a service itself, and keeps SERVICEPASSWORD out of the installation log. A virtual account is low-privileged by design, so turbo mode is unavailable under it.

SYSTEM is not a superset of you. It reaches other machines as the computer account, so a UNC path you can open may be refused. Its SSH keys live in C:\Windows\System32\config\systemprofile\.ssh; a password with the scan avoids that. And what it deletes goes to SYSTEM’s recycle bin and log.

NinjaOne

Ready-made scripts for NinjaOne

Three PowerShell scripts that run G-Scan from NinjaOne without a browser, a port or a key. Paste one into the automation library, run it as System, and schedule it. None of them deletes anything, and they work the same from any other RMM or a scheduled task. They also ship in the installation folder under docs\ninjaone.

ScriptWhat it doesExit code
GScan-DiskReport.ps1Scans a drive and fills custom fields: a summary, free space in percent, what a safe clean-up frees, and an HTML report of the largest folders and the findings0 filled, 1 scan failed
GScan-DiskAlert.ps1Checks free space first and only scans when it is low; the output then says where the space went0 fine, 1 low
GScan-Export.ps1Writes the largest files, the file types and the findings as CSV to a locked-down folder, optionally copied to a share0 written, 1 failed

Custom fields for the report

FieldTypeHolds
gscanSummaryTextUsed, free and safe clean-up in one line, with the largest folder
gscanFreePercentIntegerFree space in percent
gscanCleanableGbDecimalRecycle Bin, temporary files and downloaded updates together
gscanReportWYSIWYGThe largest folders with their share, and the findings

Create the fields first and allow automations to write to them; other names go in as parameters. Every setting is a parameter with a sensible default, such as -Drive D:\ -MinFreePercent 15, or a script variable with the same name. Tested under Windows PowerShell 5.1 with a stand-in for NinjaOne’s field command, not yet inside NinjaOne itself: if a field stays empty, check its name, its type and whether automations may write to it.

API

Everything the interface does, from a script

Plain HTTP with JSON, no SDK. Every button in the page is one call, which makes G-Scan easy to build into automation and third-party tools. Against an agent, send the key as X-GScan-Token. The Postman collection has an example for every call, and it also ships in the installation folder under api.

A request that a browser marks as coming from another website gets 403 foreignOrigin, so a web page cannot use G-Scan behind your back; scripts, curl, PowerShell and Postman are not affected. On the machine itself, gscan.com --scan C:\ --out - returns the same result as /api/result without the web server.

# start a scan
$r = Invoke-RestMethod 'http://127.0.0.1:7666/api/scan' -Method Post `
     -Body @{ path = 'C:\'; kind = 'drive'; label = 'C:' }

# wait for it
do {
  Start-Sleep -Milliseconds 400
  $j = (Invoke-RestMethod 'http://127.0.0.1:7666/api/jobs') | Where-Object id -eq $r.id
} while ($j.state -eq 'scanning')

# the findings, as codes with numbers
$res = Invoke-RestMethod "http://127.0.0.1:7666/api/result?id=$($r.id)"
$res.advice | Select-Object code, bytes
EndpointDoes
GET /api/helloIs it there, does it want a key, may it be shut down
GET /api/targetsDrives, WSL, machine, version, whether turbo is available
GET /api/browse?p=The folders inside a path, live, without a scan
POST /api/scanStart a scan: path, kind, label, and for SSH optionally password
GET /api/jobsEvery scan with its progress
GET /api/cancel?id=Stop a running scan
GET /api/result?id=The outcome: tree, largest files, types, advice
GET /api/dirs?id=&p=Any folder at any depth, with totals
GET /api/files?p=The files in one folder, live from disk
GET /api/ext?id=&e=Where one file type sits, and its largest files
GET /api/export?id=&what=CSV of types, files or advice
POST /api/deleteDelete, with dryrun=1 first; the scan follows at once, with what was freed and what went to the Recycle Bin
POST /api/emptybinEmpty the Recycle Bin on every drive, report what it freed, and update the scans
POST /api/cleanupEmpty the folders of one finding: temp files or Windows updates
GET /api/verifydups?id=Confirm suspected duplicates by reading them
POST /api/dupsacrossFind duplicates: scans (ids), extensions (exts), smallest size (min), same name (names); GET for progress and the result
POST /api/findfilesFind files: scans (ids), extensions (exts), name patterns (names), smallest size (min), sort; returns at once
GET /api/findfilesIts progress, or the files it found with the choices it ran with. The listing is remembered per scan, so a narrower question is answered without reading the disk again
GET /api/reveal?p=Open Windows Explorer there, on that machine
GET /api/forget?id=Drop a result and free its memory
POST /api/elevateRestart with administrator rights, local only
POST /api/quitShut down; an agent refuses
POST /api/updateAsk garia.net whether there is a newer version; only when called

A Linux host over SSH, with a password

curl -s -H "X-GScan-Token: $KEY" -X POST \
  -d "kind=ssh" -d "label=web01 /var" \
  --data-urlencode "path=admin@web01:/var" \
  --data-urlencode "password=$SSH_PW" \
  http://server:7777/api/scan

The password reaches ssh.exe through askpass, not its command line, and is not kept with the scan. Findings come back as codes such as recyclebin, tempfiles and duplicates, so a script can set thresholds without parsing sentences.

Changelog

1.16.11 – 19 September 2026

Fixed: Find files showed "0 found" until the end. The number found only moved once a whole scan had been searched, so with one scan ticked it stayed at 0 and every result appeared at once. It now counts while the files are being listed, with and without turbo mode, and never runs ahead of the final result. Measured on a drive of 1,498,448 files: the first count after 0.45 s, the total of 82,509 reached as the listing finished.

Fixed: "files looked at" jumped. In Find files and Find duplicates a second search started from the total of the one before, and with turbo mode the number dropped at the end of a drive (2,168,320 to 1,498,447). It now starts at 0 for every search and only goes up.

1.16.8 – 18 September 2026

Open in Windows Explorer. Every row in Find files and Find duplicates has a button that opens Explorer with the file selected. Searching is not the same as deleting.

Clearer button names. The two buttons on a row now read Open in Windows Explorer and Show here in G-Scan, in all five languages. They used to read almost the same.

Searching again is nearly free. The listing is remembered per scan, so a narrower question is answered without reading the disk again. Measured over 204,404 files: first search 2,560 ms, the same search again 259 ms, narrowed by name 140 ms. A different kind of file lists again. The list is dropped as soon as anything is deleted, emptied or cleaned up in that scan.

Progress while searching. Listing has no honest percentage, so the bar is indeterminate and shows how many files have been looked at. The count runs across all scans together and no longer resets between them, and the number found updates immediately.

1.16.2 – 18 September 2026

Fixed: the kind buttons searched nothing. Picking Photos, Video, Audio or any other kind sent an empty filter, which the server refuses, so the search returned an error instead of results. Typing a name appeared to fix it because that filled the empty filter. A name is optional, as intended.

Fixed: nothing explained itself before a scan existed. Opening Find files or Find duplicates without a finished scan went to the scan screen without a word. Both now say a scan is needed and offer a button, and the sidebar entries are disabled with the reason in their tooltip until a scan is done.

Download

Release 1.16.11

19 Sep 2026 · Windows x64 · no .NET · no VC++ runtime · EN NL FR ES PT

SHA-256 .msi f05e25aacb1283f96dbd802b83345889f045dba3506571e5cbb9acda06355337

SHA-256 .exe 6a418822e638713814f27e6ea410f3bb4962ad11118d7572c20de997a01f9a80

Words about G-Scan

Be civilNo linksOne line, 140 charactersChecked before it appears

Hey look mom im on TV.
Admin ADMIN · 2 weeks ago
G-Log Web server log analysis for admins 1.1.4 2.9 MB

Overview

1.7 s

from a 10 GB log to a full report

42,600,000

lines read, all questions at the same time

11

chapters, from traffic to security, and the advice

2.9 MB

one executable, no runtime, no install needed

G-Log turns web server logs into an answer. Point it at a folder, a share or an SSH path: it reads the logs once and hands back one self-contained page – is something wrong, where, since when, what changed and who notices. IIS and HTTP.sys, ASP.NET Core, Apache and nginx, packed or not.

Standalone on one server, or an agent on each with a G-Log server in front. Every function is also a command, a REST call and an MCP tool, and NinjaOne fills its custom fields for one machine or for all of them. Version 1.1.4, 2026-09-21.

ReportOne HTML page that stands on its own, laid out like an application: a sidebar that marks the chapter you are reading, every finding with its figure beside it, and the explanations switched off in one click once you know your way around. In English, Dutch, French, Spanish and Portuguese. The same report as JSON for a script, as CSV for a spreadsheet, or as a plain-English summary for an alert.
Command lineglog.com --report C:\inetpub\logs\LogFiles\W3SVC1 --out report.html. Exit code 3 when there is a finding of the severity you choose, so a scheduled task or an RMM can act on it.
Searchglog.com --search <folder> "status:5xx url:/api/* from:07:00 to:07:20" gives the requests themselves, with file and line number, as text, JSON or CSV.
AI assistantglog --mcp is a Model Context Protocol server over standard input and output, and a server offers the same tools over HTTP: an assistant asks the same questions and gets the same numbers as the page.
A clusterAn agent on each web server summarises its own logs; a server collects those and shows every site in one page, with alerts, search and reports on a schedule. The log lines stay where they are.
DeploymentAn MSI with real properties for SCCM, Intune, GPO and NinjaOne, ready-made NinjaOne scripts, and a NinjaOne connection that fills the custom fields of every web server by itself.

Reads IIS, ASP.NET Core, Apache and nginx, packed or not

u_ex*.log w3clog*.txt access.log access.log.1 *.gz *.zip httperr*.log \\SERVER\logs$ ssh://user@web03/var/log/nginx

The usual shapes are recognised by themselves, including nginx logs written as JSON. Wrote your own log_format or LogFormat? Hand G-Log that line, or the configuration file it stands in, with --log-format.

What you get

Five questionsIs something wrong, where, since when, what changed and who notices – each with the answer measured from the log.
Advice36 kinds of finding, most severe first, with the numbers, what it means and what to do. Card numbers in URLs carry their PCI DSS requirement.
The log linesNext to a row with errors, a slow page or a security finding, one click opens the lines from the log itself: file, line number, and every field by name.
Two periods--compare with yesterday or the week before a deploy: what got slower, which errors and endpoints are new.
Honest gapsAn analysis that the log cannot support says why, and chapter 0 says which field to turn on and how – instead of showing an empty table.
ExportJSON, CSV per table (also from the page), and a plain-English summary. Every number in the page comes from the same report.

G-Log only reads. It opens log files so the web server can keep writing, rotating and deleting them while it reads, and it changes no setting on your web server – not the logging fields, not the rollover, not the ETW destination. Reading a log installs nothing and opens no port; a service and a port come in only when you choose to run the agent or the server for a cluster, and then you say so yourself.

Screenshots

G-Log report: is something wrong, where, since when, what changed and who notices, with the key numbers of the log
The five questions
G-Log errors chapter: status codes over time, the URLs with server errors, and the log lines behind a row
Errors
G-Log performance chapter: response time percentiles over time, the slowest pages and where server time goes
Performance
G-Log security chapter: attack patterns, card numbers found in URLs and secrets in query strings, each with the requests behind them
Security
The page of a G-Log server: the alerts, the sites of the cluster with the machines that run them, and the agents with their last contact
A cluster in one page

Examples

The report of a site, in the browser

glog.exe --open C:\inetpub\logs\LogFiles\W3SVC1

Or right-click a log folder, a .log, a .gz or a .zip and choose Analyse with G-Log.

A site together with the HTTP.sys error log, and yesterday next to it

glog.com --report C:\inetpub\logs\LogFiles\W3SVC1 --report C:\Windows\System32\LogFiles\HTTPERR ^
         --compare C:\inetpub\logs\LogFiles\W3SVC1\u_ex260912.log --out today.html

The requests behind an incident

glog.com --search C:\inetpub\logs\LogFiles\W3SVC1 "status:5xx from:2026-09-11T10:00 to:2026-09-11T10:29"
glog.com --search C:\inetpub\logs\LogFiles\W3SVC1 "client:10.51.141.11" --format csv --out client.csv

In a script or an RMM: the last 15 minutes, as an alert text

$glog = "$env:ProgramFiles\GariaNetTools\G-Log\glog.com"
& $glog --report C:\inetpub\logs\LogFiles --since 15m --format text --fail-on warning
if ($LASTEXITCODE -eq 3) { exit 1 }

Use glog.com, not glog.exe: it waits for the analysis and passes the exit code on. Only the lines of that window are read, and log files last written before it are skipped, so a folder with months of logs costs no more than today’s file.

One table for a spreadsheet or a ticket

glog.com --report C:\inetpub\logs\LogFiles\W3SVC1 --tables
glog.com --report C:\inetpub\logs\LogFiles\W3SVC1 --format csv --table errors.statusCodes --out status.csv

Install (MSI)

One MSI, per machine, 64-bit, nothing else needed: the report page is a resource inside glog.exe and the runtime is compiled in. It goes out through GPO, Intune, SCCM or an RMM without a wrapper script.

msiexec /i G-Log-1.1.4-x64.msi /qn
msiexec /x G-Log-1.1.4-x64.msi /qn
ADDTOPATH1 (default) or 0 – the installation folder in the system PATH, so glog works in every new command prompt
CONTEXTMENU1 (default) or 0 – Analyse with G-Log on folders and .log, .gz and .zip files
MASKSENSITIVE0 (default) or 1 – client addresses, user names, passwords, tokens and card numbers masked in every report
INSTALLFOLDERanother folder, default C:\Program Files\GariaNetTools\G-Log
msiexec /i G-Log-1.1.4-x64.msi /qn ADDTOPATH=1 CONTEXTMENU=0 MASKSENSITIVE=1 INSTALLFOLDER="D:\Tools\G-Log"
G-Log-1.1.4-setup.exe /VERYSILENT

An update never needs a restart. Whatever is running from the installation folder steps aside first – the services, and an agent or server that is not a service: a scheduled task, an RMM, a window someone left open. They carry a hidden window so Windows can ask them to close the way it asks any other program, and the installer starts again what it stopped. An agent that ran under its own account is not put back, because its credentials are not kept anywhere; that is written to the registry under LastUpdate so you can see why it is standing still.

G-Log never checks for updates by itself. Ask it and it answers: glog --check-update gives exit code 0 up to date, 3 when there is a newer version, and 1 when garia.net could not be reached – so an RMM can put a condition on it. Nothing about the machine goes with that question.

Start the MSI from a local folder such as C:\Temp. On many work computers Downloads lives on a network share or in OneDrive, where the Windows Installer service cannot read it: that ends in error 1619 without installing anything. Read access to the log folders is all G-Log needs; it does not have to be an administrator.

Rolling out the agent and the server, the rights they need, which fields to log in IIS, and what to do about a log folder on a share: the administrator guide walks through it. It is installed as well, under docs.

Agent and server

One log file is a command away. A cluster is something else: five web servers, three sites each, and the question is which one started failing. G-Log answers that without moving your logs anywhere.

The agentRuns on the web server, reads its own logs and sends a summary – a few hundred kilobytes a day instead of gigabytes. The log lines never leave the machine; when the server needs them, it asks for exactly the ones you searched for.
The serverCollects those summaries and makes one report per site over every machine. Sites are matched by their name in applicationHost.config, not by W3SVC7, because that number differs per node.
Without an agent everywhereOne agent on a jump server can read the log folders of several web servers over their admin share: --agent-path "Shop=\\web01\d$\inetpub\logs\logfiles\W3SVC1". The name in front of the path names the site, so the same site under a different IIS id on each server still becomes one report, with the servers side by side in Per server and site.
One pageAlerts, sites and agents on the front screen, and behind its tabs: search the log lines of a site, the reports that were made on schedule, the PCI review, and the settings of that machine.
EncryptedAgent and server speak TLS and recognise each other by the fingerprint of their certificate. Pairing is one command and a one-time key, so the key that opens the whole cluster is never typed on a web server.
Linux tooA web server without an agent – nginx or Apache on Linux – is read over SSH, and only the bytes that were added since last time come across. Signing in goes with a key, or with a password when that server takes nothing else: --ssh-password asks for one, --ssh-save-password keeps it with the other keys so a service can use it.

A server and an agent, in two commands

glog --server --pair-key                     on the collecting server: prints a one-time key
glog --agent --pair <key> --push https://logserver:7788

Both run as a Windows service with --service. The agent reads with one core in background priority and a hard ceiling of ten percent of the processor: the web server comes first.

AlertsA site that fails, one that is slower than its own baseline, a server that has gone quiet, logging that stopped. Out through the Windows event log, a webhook, or syslog and CEF to your SIEM – every alert carries a link to exactly the view it is about.
Server contextApp pool crashes and recycles, deploys, certificates with their expiry date, and what the worker processes were doing – next to the requests, on the same timeline.
Reports on a scheduleA daily report at six, a weekly one on Monday, written to a folder or a share, with a retention. Plain JSON to configure, no scheduled task.
To your SIEMAn agent can forward the log lines themselves over syslog, raw or as CEF, filtered with the same query language as the search. G-Log delivers to a SIEM; it does not replace one.
Within secondsHTTP.sys writes its buffer once a minute. With --etw an agent reads along over the IIS ETW provider instead, on IIS 8.5 and later. G-Log never changes that IIS setting for you.

Service account

The services do not have to be LocalSystem

By default GLogServer and GLogAgent run as LocalSystem: it always works, and it can read every file. G-Log only reads, so an account with read access to the log folders is enough – and on a web server that is usually what you want. Choose one with a thing in mind: what an account cannot read is missing from the report, and G-Log says so in chapter 0 rather than leaving it out quietly.

msiexec /i G-Log-1.1.4-x64.msi /qn AGENT=1 SERVICEACCOUNT="DOMAIN\svc-glog" SERVICEPASSWORD="..."

The installer first grants that account the right to log on as a service and then creates the service under it. That order matters: sc.exe does not grant the right, and without it the service fails to start with error 1069 – a message that does not say what is wrong. SERVICEPASSWORD is a hidden property, so it does not end up in the installation log.

On an installation that already exists

glog --grant-service-logon "DOMAIN\svc-glog"
sc config GLogAgent obj= "DOMAIN\svc-glog" password= "..."
sc start GLogAgent

A virtual account (NT SERVICE\GLogAgent) needs no password and no right: the service manager arranges both. A gMSA needs the right but no password.

What that account needs, and nothing more

The log foldersread access. On IIS that is the folder glog --sites shows; on a Linux web server over SSH it is the group adm
%ProgramData%\GariaNet\G-Logfull access: the keys, the store and the audit trail live there
The Windows event logonly if you keep alerts there, which is the default
applicationHost.configread access, to find the sites by their name instead of by W3SVC7

It does not have to be an administrator and it does not need to log on interactively. LocalSystem is not a superset of you: it reaches other machines as the computer account, so a share you can open yourself may be refused, and its SSH keys live somewhere else. If an agent suddenly reads nothing after a change of account, that is where to look first.

The firewall

An agent and a server listen on the network, so Windows Firewall wants to know about them. The installers add a rule for the private profile when you choose the service (SERVER=1 or AGENT=1), and then nothing is asked. Start one by hand and Windows asks once, with Public networks already ticked – untick that and leave Private on. Only need it on this machine, or on one network card? --bind 127.0.0.1 or --bind 10.0.0.5 keeps it there, and then the question does not come at all.

PCI DSS 10

Requirement 10 of PCI DSS 4.0.1 asks for things a web server log can help with, and for things it cannot. G-Log does the first and says the second out loud.

10.4.1A review of every day that has passed, written by the server itself: the findings of that day, a status per finding (open, investigated, accepted, resolved) with its history, and a sign-off by name. Nothing is ever overwritten.
10.3.4Every log file that is finished gets a SHA-256 the first time it is seen closed. A file that changes afterwards, or disappears, becomes a finding and stays one.
10.2.1.3An audit trail of its own: who asked this server for which report, search, export or setting, from which address and with which key.
10.3.3Forwarding the log lines to the central, protected place you already have, over syslog or CEF.
10.5.1How far the history reaches, against the three months that must be immediately available and the twelve that must be kept.
3.5.1Card numbers in URLs are found by their check digit and carry the requirement they belong to. Masking is a choice at install time, not a default.

What a web server log does not hold: sign-ins to your application, administrator actions, and access to card data per user. Those come from the application and the Windows security log. G-Log is not the central log store an auditor expects either – it forwards to the one you have. It helps an organisation meet requirement 10; it does not make it compliant, and it says so on the page where you sign a day off.

A name is not an account. G-Log has no user accounts – whoever can read the logs can read the data – so what is recorded is the name someone typed and the Windows account the command ran under.

NinjaOne

NinjaOne has no web server log monitoring of its own: its HTTP monitor says from the outside that a site is down. These three scripts say why, from the logs on the server itself. PowerShell 5.1, run as System, every setting a parameter or a script variable.

GLog-Alert.ps1Reads the last 15 minutes. Exit code 1 when there are findings of the chosen severity, and the output is the alert text: requests, error shares, response time, and each finding with what to do.
GLog-Report.ps1Reads the last 24 hours into custom fields: a summary, requests, server error percentage, p95, the findings, and an HTML report for a WYSIWYG field.
GLog-Search.ps1The log lines of the last hour that match a query, such as every server error on the payment pages, with an alert when there are any.
NinjaOne guideWhich custom fields to create, how to add the scripts, and what the output looks like.

The scripts were tested under Windows PowerShell 5.1 with a stand-in for NinjaOne’s field command, against generated logs. They have not been run inside NinjaOne itself, and that is said here rather than left out. The same approach works from any RMM, a scheduled task or a runbook.

Or no script at all

A G-Log server can fill the same custom fields over the NinjaOne API, for every web server it collects, so nothing has to run on those machines. It needs an API app of the type Machine to Machine; the client secret is kept with the other keys, in a file only SYSTEM and administrators can read.

glog --ninja-setup --ninja-url https://eu.ninjarmm.com --ninja-client-id <id> --ninja-client-secret <secret>
glog --ninja-fields     shows what would be sent, without sending it
glog --ninja-now        sends it once

Alerting stays a condition in NinjaOne, on one of those fields or on the Windows event G-Log writes. That is not a shortcut: the NinjaOne API cannot raise an alert, and cannot open a ticket without a user context.

JSON, CSV and MCP

Everything the page shows is in one JSON report with a version, the same for the command line and for an AI assistant. The report schema lists every chapter, analysis, reason and advice code.

--format jsonthe whole report; --with-text adds the English title and what to do to every finding
--format csv --table <name>one table for a spreadsheet; --tables lists them. A value that a spreadsheet would read as a formula is made harmless
--format texta summary in plain English, for an alert or a ticket
--fail-on info|warning|criticalexit code 3 when the report has a finding of that severity or worse
--since 15m, --from, --toonly the lines of that window, in UTC

An AI assistant on your logs

claude mcp add glog -- "C:\Program Files\GariaNetTools\G-Log\glog.exe" --mcp

Nine tools over standard input and output: an overview, the findings, ranked lists, a metric over time, what the log contains, what changed between two periods, the log lines themselves, a whole chapter, and what a status or error code means. The server only reads; writing an HTML report needs --allow-write, and then only to a file that does not exist yet. The answers are the same numbers as the page, because they come from the same report.

A G-Log server offers the same tools over HTTP at /mcp, behind its key, so an assistant on a workstation can ask about the whole cluster by site name instead of by path – with nothing installed on that workstation.

API

Everything the page does, from a script

Plain HTTP with JSON, no SDK. Every view in the page is one call, and the numbers are the same ones the report holds – there is no second source. The Postman collection has an example for every call; it also ships in the installation folder under api, next to the report schema.

On this machine the page listens on 127.0.0.1:7668 and asks for no key. A server or an agent on the network listens on 7788 over HTTPS with its own certificate, and every call needs the key of that machine in X-GLog-Token. Start with /api/hello: it says which role you reached, whether a key is required, and the fingerprint of that certificate. Call it over http:// by mistake and you get a 400 that says so, rather than a closed connection.

The report and the requests

GET /api/hellotool, version, role, whether a key is needed, TLS fingerprint. The only call that never needs a key
GET /api/reportthe whole report as JSON, from path=, paths= or – on a server – site=, with since, from, to and compare
GET /api/adviceonly the findings, most severe first, with the numbers behind them
GET /api/overviewthe five questions and the key numbers
GET /api/inventorychapter 0: which files, which fields are logged and which are missing, and what that costs you
GET /api/searchthe matching log lines with file, line number and every field by name; pages with skip and limit
GET /api/summarythe analysis in G-Log’s compact format – what an agent sends instead of the lines themselves
GET /api/explainwhat a status, substatus, Win32 code or HTTP.sys reason means, and what to check

The cluster

GET /api/cluster/sitesthe sites this server collects, with the machines that run them
GET /api/agentsper agent: version, mode, last contact, clock difference, last error
GET /api/alertswhat is firing and what resolved, each with a link to the view it is about
GET /api/agent/statuson an agent: its sites, its last round, and what it forwarded or received over ETW
GET /api/agent/summaries
GET /api/agent/summary
what an agent has ready, and one summary as bytes
GET /api/agent/contextapp pool crashes, deploys, certificates and worker processes – with a day, or the list of days
POST /api/pairtrade a one-time key for a key of your own, so the cluster key is never typed on a web server
POST /api/ingest
POST /api/agent/heartbeat
POST /api/agent/context
the other direction: an agent that sends by itself delivers its summaries, its heartbeat and its context

Reports, PCI and the machine itself

GET /api/reports
GET /api/reports/file
the schedules with their next run and the files they made, and one of those files
GET /api/reviews
GET /api/review
the last thirty daily reviews with the retention figures, and one day in full
POST /api/reviewsign a day off, or move one finding to investigated, accepted or resolved
GET /api/integrityevery sealed log file with its SHA-256 and whether it is still the same file
GET /api/auditwho asked this server for what, from which address and with which key
GET /api/settingsversion, role, port, TLS, retention and where the files live – never a key
GET /metricsthe same numbers in the format Prometheus scrapes
POST /mcpthe MCP tools over HTTP, for an AI assistant that has nothing installed locally

One call, from anywhere

curl -H "X-GLog-Token: $key" "https://logserver:7788/api/search?site=Shop&query=status:5xx%20since:1h&limit=20"

A question about a site goes to the machines behind it, so the log lines stay on the web server until you ask for exactly those. Each line comes back with the machine it came from.

Changelog

The Per server and site panel of a cluster report: each web server with its requests, its share of the traffic, its client and server errors and its p95, so one server that lags behind the others stands out
New in 1.1.4: one report over every server, whatever the site id

1.1.4 – 21 September 2026

Name a site yourself

An agent reading a folder named the site after that folder, so two web servers running the same site under different IIS ids – W3SVC1 on one, W3SVC3 on the other – ended up as two separate sites, each with one machine, instead of one cluster with one report. --agent-path now takes a name in front of the path:

glog --agent --agent-path "Shop=\\web01\d$\inetpub\logs\logfiles\W3SVC1" ...
glog --agent --agent-path "Shop=\\web02\d$\inetpub\logs\logfiles\W3SVC3" ...

Both agents then report site Shop, and the server puts them in one report with the servers side by side. The name also works on an ssh:// source, and the same string works in the AgentPaths value in the registry. The equals sign only counts when it comes before the path, so a folder whose name contains one is still just a path.

1.1.3 – 21 September 2026

Two agents and a server on one machine now start

Every certificate G-Log makes for itself is stored under one key name, and making a new one overwrites the key of the old. Start two agents and a server at the same time on a machine that has no certificate yet, and all three make one: the last to finish keeps the key, the other two are left holding a certificate whose key no longer matches. Those two went on listening, and every connection to them failed – no message on either side beyond SEC_E_INTERNAL_ERROR, "the Local Security Authority cannot be contacted", which says nothing about the cause. That is exactly what a cluster of two web servers read from one jump server looks like.

Three things changed:

  • Only one process at a time creates a certificate, and whoever waited looks again first.
  • A certificate is only used when its key really belongs to it, checked by comparing the public key on the certificate with the one on the key itself. So a machine that already has the broken ones recovers by itself.
  • Making a new certificate removes the older G-Log ones, because their key has been overwritten anyway.

1.1.2 – 20 September 2026

The report holds its shape

Found on a real IIS server with long URL paths, and on narrower windows than the layout of 1.1.0 was checked on.

  • Below 1040 pixels the page no longer scrolls sideways. The table of contents falls back to a strip that scrolls on its own, but the column holding it was sized to that strip, which made the whole page as wide as the list of chapters.
  • The five questions size themselves to the panel they are in, not to the window. Beside the key numbers they had half the width and were squeezed into five columns of about 90 pixels, which broke "requests" into "request s". They now take the full row, and where five do not fit they fall back to three and two.
  • A long URL stays inside its card. In What changed? a path such as /ServiceCenter/PlatformServices_v8_0_0.asmx ran past the edge of the card and under the one beside it.
  • The key numbers use the whole row, with the status ring beside the figures instead of below them.
  • What changed? no longer says the same thing twice. "Needs a second period" was followed by "Needs a comparison with a second period"; the second line now says how to get one.

Availability says when long-open requests are pulling it down

A site that uses server-sent events, long polling or timers keeps requests open for minutes on purpose. Those requests count in the 95th percentile of every minute they span, so almost every minute is marked bad and availability drops – while the site is answering normally. On a real IIS server this produced 8.7% availability with 0.04% server errors. Availability per minute now says so when such URLs account for a fifth or more of all measured time, and gives their share, with chapter 3 naming the URLs. The figures themselves are unchanged: the minutes really were slow, and a report should not quietly leave data out.

http:// on an https port says so

An agent and a server listen with TLS. A request to http://host:7811/api/hello used to get the connection closed, which curl reports as "empty reply from server" – true, but it does not say the scheme was wrong. Such a request now gets 400 Bad Request with one line: this port speaks HTTPS. Only for a first packet that is plainly not a TLS record; a client that speaks TLS and dislikes the certificate still gets nothing, which is the point of a certificate.

Download

Release 1.1.4

21 Sep 2026 · Windows x64 · no .NET · no VC++ runtime · EN NL FR ES PT

SHA-256 .msi d0e6598f0de8abefc8d28e084de77bf737c35794bbb97baefd7613fe678a2b38

SHA-256 .exe 7532711985c2cfc3585992648d81df5349fcf9958b33e7968237bd2146cbe6ff

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