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Monitoring Openvpn-Connection to Sophos UTM

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Task was to find out who is logged in by openvpn to our Sophos UTM 9.

this does not give results

I could not find any hints in SNMP-output nor "cc get_objects" (this is for configuration not for monitoring).

this works

ssh [email protected]

/usr/local/bin/openvpn_connections.sh

OpenVPN CLIENT LIST
Updated,Wed Mar 25 10:53:27 2020
Common Name,Real Address,Bytes Received,Bytes Sent,Connected Since
openvpn-myuser1,1.2.3.4:63969,4333648,11695199,Wed Mar 2 06:58:51 2020
openvpn-myuser25,1.20.36.99:55371,9183690,57628351,Wed Mar 2 07:28:08 2020
REF_AaaUse99,30.50.20.1:53100,16113267,48635679,Wed Mar 2 05:01:58 2020
...

I am using this output to feed a webservice via a perl-script which gives me data for PRTG, my monitoring-tool with the sensor "Http Data Advanced"

http://prtghelper.local/prtg-openvpn-utm

{
prtg: {
  text: "openvpn-sophos"
  result: [
    {
      value: 16,
      channel: "openvpn-connections-number"
    },
    {
      channel: "openvpn-myuser1"
      value: 1,
    },
    ...
  ],
}

This is what you need to implement this solution

  • Extra Linux-Webserver which runs a perl-script (or other language to ssh to UTM and parse the output)
  • Open SSH in Sophos to the Linux Webserver for it to get the data for openvpn

firewall monitoring openvpn sophos

Created on Mar 25, 2020 12:12:42 PM by  richard-lippmann (21) 1



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.