CS2 Disconnect Watcher

The CS2 Disconnect Watcher monitors text log files (one per CS2 instance). When an instance disconnects from a match, CS2 (or your launcher wrapper) typically writes a line that includes keywords like "disconnected" or "connection lost". The watcher detects those lines and sends an alert.

Important requirement

C:\CS2-Watchdog\
+-- disconnect-watcher.ps1
+-- start-watcher.bat (optional)
+-- logs\
   +-- instance01.log
   +-- instance02.log
   +-- instance15.log
+-- watcher.log (auto-created)

The watcher reads all *.log files from C:\CS2-Watchdog\logs. It keeps an internal file position per log and only processes new lines.

1) Create directories

mkdir C:\CS2-Watchdog
mkdir C:\CS2-Watchdog\logs

2) Create the script files

Create the files below by copying the content from the Scripts section: disconnect-watcher.ps1 and optionally start-watcher.bat.

3) Ensure per-instance logs exist

You must have per-instance log files in C:\CS2-Watchdog\logs. Example file names: instance01.log, instance02.log, and so on.

Open disconnect-watcher.ps1 and set these variables:

$LogDir = 'C:\CS2-Watchdog\logs'
$CheckEverySeconds = 2

$TelegramBotToken = 'YOUR_BOT_TOKEN'
$TelegramChatId   = 'YOUR_CHAT_ID'
$DiscordWebhook   = 'YOUR_DISCORD_WEBHOOK_URL'

Disconnect keywords

If you do not get alerts, your log lines might use different words. Update the list:

$DisconnectKeywords = @(
  'disconnected',
  'connection lost',
  'connection to server lost',
  'kicked',
  'dropped from server',
  'server connection failed'
)

Create these files in C:\CS2-Watchdog. All content is ASCII-only (no emojis and no special characters).

disconnect-watcher.ps1

# CS2 Disconnect Watcher (ASCII only)
# Detects in-game disconnects via log monitoring
# File: C:\CS2-Watchdog\disconnect-watcher.ps1

# ====== CONFIG ======
$LogDir = 'C:\CS2-Watchdog\logs'
$CheckEverySeconds = 2

$TelegramBotToken = 'YOUR_BOT_TOKEN'
$TelegramChatId   = 'YOUR_CHAT_ID'
$DiscordWebhook   = 'YOUR_DISCORD_WEBHOOK_URL'

# Keywords that indicate a disconnect from a match
$DisconnectKeywords = @(
    'disconnected',
    'connection lost',
    'connection to server lost',
    'kicked',
    'dropped from server',
    'server connection failed'
)

# ====== INTERNAL ======
$BaseDir = Split-Path -Parent $PSCommandPath
$State   = @{}
$LocalLogFile = Join-Path $BaseDir 'watcher.log'

function Write-LocalLog($msg) {
    $line = "[{0}] {1}" -f (Get-Date -Format 'yyyy-MM-dd HH:mm:ss'), $msg
    Add-Content -Path $LocalLogFile -Value $line
}

function Send-Telegram($text) {
    try {
        Invoke-RestMethod `
            -Uri ("https://api.telegram.org/bot{0}/sendMessage" -f $TelegramBotToken) `
            -Method Post `
            -Body @{ chat_id = $TelegramChatId; text = $text } | Out-Null
    } catch {
        Write-LocalLog ("Telegram error: {0}" -f $_.Exception.Message)
    }
}

function Send-Discord($text) {
    try {
        $payload = @{ content = $text } | ConvertTo-Json -Depth 3
        Invoke-RestMethod `
            -Uri $DiscordWebhook `
            -Method Post `
            -ContentType 'application/json' `
            -Body $payload | Out-Null
    } catch {
        Write-LocalLog ("Discord error: {0}" -f $_.Exception.Message)
    }
}

Write-LocalLog ("Disconnect watcher started. Monitoring: {0}" -f $LogDir)

# Initialize known log files
Get-ChildItem $LogDir -Filter *.log -File -ErrorAction SilentlyContinue | ForEach-Object {
    $State[$_.FullName] = 0
}

while ($true) {
    Get-ChildItem $LogDir -Filter *.log -File -ErrorAction SilentlyContinue | ForEach-Object {

        if (-not $State.ContainsKey($_.FullName)) {
            $State[$_.FullName] = 0
        }

        try {
            $fs = [System.IO.File]::Open($_.FullName, 'Open', 'Read', 'ReadWrite')
            $fs.Seek($State[$_.FullName], 'Begin') | Out-Null
            $sr = New-Object System.IO.StreamReader($fs)

            while (-not $sr.EndOfStream) {
                $line = $sr.ReadLine()
                if ($line) {
                    $lower = $line.ToLower()
                    foreach ($kw in $DisconnectKeywords) {
                        if ($lower -like ("*{0}*" -f $kw)) {
                            $inst = [System.IO.Path]::GetFileNameWithoutExtension($_.Name)
                            $msg = "ALERT: CS2 instance $inst disconnected from match. Time: $(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')"
                            Send-Telegram $msg
                            Send-Discord  $msg
                            Write-LocalLog $msg
                            break
                        }
                    }
                }
            }

            $State[$_.FullName] = $fs.Position
            $sr.Close()
            $fs.Close()
        } catch {
            Write-LocalLog ("Read error for {0}: {1}" -f $_.FullName, $_.Exception.Message)
        }
    }

    Start-Sleep -Seconds $CheckEverySeconds
}

start-watcher.bat (optional)

@echo off
cd /d C:\CS2-Watchdog
powershell.exe -NoProfile -ExecutionPolicy Bypass -File disconnect-watcher.ps1

Recommended start file

Create start-watcher.bat inside C:\CS2-Watchdog (see Scripts section).

Create a scheduled task

1. Open Task Scheduler and click Create Task
2. Name: CS2 Disconnect Watcher
3. Enable Run with highest privileges
4. Trigger: At startup
5. Action: Start a program
6. Program: C:\CS2-Watchdog\start-watcher.bat
7. Start in: C:\CS2-Watchdog

No alerts received

• Verify Discord webhook URL is valid.
• Verify Telegram bot token and chat id are correct.
• Check C:\CS2-Watchdog\watcher.log for errors.
• Your log line may not contain the keywords. Update the keyword list.

Logs not updating

• Make sure each instance writes to a file in C:\CS2-Watchdog\logs
• Ensure the log files are not locked exclusively by another process