[Xymon] HTTPS monitoring, with different IP

[Adam Goryachev]

I have a strange setup, my web server is behind a 1:1 NAT, and xymon is 
also behind the same router. The router doesn't support network pinning 
(ie, go out, and then translate on the way back in again), so the 
network test simply timeout.

I've found a "solution" which is to configure xymon to talk to the 
internal IP address instead of the external one, but instead of changing 
the DNS or using /etc/hosts file, I want to keep this change to the 
xymon config.

So currently I have this:

0.0.0.0        www.mysite.com.au            # noconn 
httpstatus;https://mysite.com.au=10.0.0.23/;2..

This solves the problem for the http column (I get a green dot, and 
everything is OK), but I get a red dot for sslcert because xymon is 
looking at the wrong SSL certificate (not using SNI correctly).

I'm using the xymon package from debian version 4.3.28-5+deb10u1 in case 
that is relevant.

Is there a solution to have xymon correctly monitor the SSL certificate 
when using a different IP address?

Regards,
Adam