Teamcity Jabber Notifier to server with unsigned certificate

Hi all.

I'm setting up Teamcity server to run on Raspbian, with a MySql database.  It's working great up to this point.  (note: the PI 3B+ I'm using doesn't run a build agent)

I'm looking to setup the Jabber Notifier but I'm having some problems with it.

I've setup a Jabber Server on another PI using ejabberd (turns out this was nice and easy to setup)

and have created some accounts for it.    I've got it working with pidgn and with my iPhone.

However to connect I'm using a self signed certificate.

when I try to connect from my teamcity server, i get the following error...

Connection failed!

any ideas how I can get teamcity to accept the self signed cert?    (please remember that I've got a linux back end rather than windows)