I think the crtificate still missing something more than signing by an official authority .. The chrome browser won't let me connect to the forum at all - (see attachments) - also the (pidgin based) OSX instant messenger Adium that I'm using on OXS to access my jabber account won't let me connect with an SSL Handshake error - normally I would simply trust you self signed certificate, but Chrome would not even let me display it..
this certificate has nothing to do with heartbleed bug. Our Jabber cert just ends on april 8th 2014 so simply we needed a new one ...
To the problem
The forum uses a Cert from 31.10.2013. The CommonName is "board.phcn.*" This could be a problem for your Chrome if it uses an old ssl lib (older than 4 years). The Cert uses 8192bits this could be a problem too
Our Jabber server uses the same style for "*phcn.de" . We also got some errors with older Pidgin versions on windows because they used an old ssl lib from 2006-2008 (why?)
Please have a look at your browser whether you see our RootCA. See my screenshot