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s-h-a-d-o-w/offline-check.ps1

Last active January 31, 2026 15:23
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Repeatedly checks whether a certain IP is reachable and shows a popup if it's not.
Raw
offline-check.ps1
$ip = "..."
Add-Type -AssemblyName System.Windows.Forms
$ping = New-Object System.Net.NetworkInformation.Ping
while ($true) {
$failures = 0
for ($i = 0; $i -lt 15; $i++) {
try {
$result = $ping.Send($ip, 3000) # 3 second timeout
if ($result.Status -ne 'Success') { $failures++ }
} catch {
$failures++
}
Start-Sleep -Seconds 1
}
if ($failures -eq 15) { # All 15 failed
[System.Windows.Forms.MessageBox]::Show(
"Device $ip is offline!",
"Network Alert",
[System.Windows.Forms.MessageBoxButtons]::OK,
[System.Windows.Forms.MessageBoxIcon]::Warning
) | Out-Null
}
Start-Sleep -Seconds 5
}
@s-h-a-d-o-w
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Author

s-h-a-d-o-w commented Jan 31, 2026

Don't use Test-Connection, it's highly unreliable.

Also, for running this in the background with Task Scheduler, you'll need a second script:

Start-Process pwsh -ArgumentList @(
    "-ExecutionPolicy", "Bypass",
    "-File", "...\offline-check.ps1"
) -WindowStyle Hidden

exit

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