Setting up a new Lync 2013 install in the Company Network I got everything nearly working except Client Login.
here seems to be a mismatch of capabilities or some Settings in the TLS area - Connection Fails, and I get quite a lot of Schannel Events 36874. EventData is:
<EventData> <Data Name="Protocol">TLS 1.2</Data> </EventData>
The General text is:
An TLS 1.2 connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server. The SSL connection request has failed.
There is no clear documentation how to handle it - it is related to SOME SORT of TLS encryption issues, but Windows does not even like to tell what. There SUPPOSEDLY is a GPO Setting regarding allowed encryptions, but I am not able to find it - maybe a temporary blindness, or it is well hidden.
Own CA, that all works. Servers are fresh installed 2012, and a fresh installed Windows 8 for the Client. The Domain is older (so old Default Settings in a GPO may cause this).
This is quite frustrating. Links to the Event ID on the Internet find mostly People that have the problem, no clear Information how to handle it. Anyone can point me to the right direction?