[Xymon] Port Check on a Server

Hello,

I have a system that is running a rsyslog server on a non standard port and is an appliance. I need to check that the several ports are up and listening, however I can not install a client on the system.

The test would need to be initiated from the xymon server. I assume I need a custom script, can someone point me in the right direction for this. Heres nmap output. Preferably I'd like to check if the port 443, 517,8001, 8002,and 80003 are all open. If any of those are not open, go red.

PORT STATE SERVICE 22/tcp closed ssh 443/tcp open https 517/tcp open XXXX 8001/tcp open XXXX 8002/tcp open XXXX 8003/tcp open XXXX