I set up a new Lync server, everything worked fine except for conferencing which would fail with the error “Conferencing server did not respond”.
Enabling logging shows the following error
A SIP request made by Communicator failed in an unexpected manner (status code 80ef025b). More information is contained in the following technical data:
ms-diagnostics: 3098;reason=”No MCU Factory Available”;source=”epic-lync01.epic.intra”;OriginalPresenceState=”0″;CurrentPresenceState=”0″;MeInsideUser=”Yes”;ConversationInitiatedBy=”0″;SourceNetwork=”0″;RemotePartyCanDoIM=”No”
Most of the forums speak to this being caused by using a self signed cert but in this case I was using a cert from GoDaddy.
To resolve this you need to enable your certificate for All Purposes.
On your Lync server, in IIS, go to server certificates and View your certificate. Go to the Certification path tab and select the top cert in the tree and select View Certificate. Then go to the Details tab, select “Edit properties and select the radio button for “Enable for all purposes”
This should resolved my issue