We are running Gaia 75.40, and trying to get Skype for Business going. This is an on premise installation, with one Front End Server, and one Edge.
We cannot seem to get Federation working, which from what I understand requires port 5061. We have created an object for Port 5061 (TCP) with nothing in the Protocol Type. However every time we run the MS Analyzer, the test fails as the SSL Negotiation:
|Testing the SSL certificate to make sure it's valid.|
| ||The SSL certificate failed one or more certificate validation checks.|
Elapsed Time: 756 ms.
|The Microsoft Connectivity Analyzer is attempting to obtain the SSL certificate from remote server sip.smdhu.org on port 5061.|
| ||The Microsoft Connectivity Analyzer wasn't able to obtain the remote SSL certificate.|
The certificate couldn't be validated because SSL negotiation wasn't successful. This could have occurred as a result of a network error or because of a problem with the certificate installation.
Elapsed Time: 728 ms.
If I test this using Port 443, everything works fine (but that does not help me).
I have been banging my head against this for a while.