PRTG IPsec tunnel monitor script
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PRTG IPsec tunnel monitor script

L0 Member

We are using PRTG for network monitoring and need to have alerts created and sent when an IPsec tunnel goes down. i found some article for scripts to use with the advanced script sensor, but we run into issues when actually trying to run the script. it seems to just stop the connection and Powershell ISE shows an error for the line invoking the rest method.

 

Here is the script we are trying to use :
# Disable SSL certificate checking so we can connect to servers using a cert signed by a private CA
[System.Net.ServicePointManager]::ServerCertificateValidationCallback = { $true }

#Set Powershell to use TLS1.2 when connecting to the Firewall
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12,
[Net.SecurityProtocolType]::Tls11

$VPNTunnelURI = @{uri = "https://(FW IP Address)/api/?type=op&cmd=<show><vpn><ipsec-sa><tunnel>(TUNNEL NAME)</tunnel></ipsec-sa></vpn></show>&key=(Key Removed)";
    "Method"  = 'GET';
    }

#Set Powershell to use TLS1.2 when connecting to the Firewall
#[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls -bor [Net.SecurityProtocolType]::Tls11 -bor [Net.SecurityProtocolType]::Tls12



[xml]$VPNTunnelStateXML = Invoke-RestMethod @VPNTunnelURI

$VPNTunnelStateTest = $VPNTunnelStateXML.SelectSingleNode("//response/result/error")
   
If ($VPNTunnelStateTest -ne $null) {
    $VPNTunnelStateResult = 1
}
Else {
    $VPNTunnelStateResult = 0
}

Write-Output "STATE"
Write-Output $VPNTunnelStateTest
# XML Output for PRTG
Write-Host "<result>"
"<channel>$VPNTunnelName</channel>"
"<value>$VPNTunnelStateResult</value>"
"<showChart>1</showChart>"
"<showTable>1</showTable>"
"<LimitMaxError>0</LimitMaxError>"
"<LimitMode>1</LimitMode>"

"</result>"
Write-Host "</prtg>"

This is a screen shot of the error we get when testing, upon research it looked like a TLS issue but this is with the script being forced to use TLS1.2 and we verified with wireshark it is connecting over TLS1.2

This is the error we are seeing when testing the scriptThis is the error we are seeing when testing the script

 

Looking for any help with the script or another possible method to be able to get tunnel down alerts with PRTG

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