Issue: Unable to upload or Present PowerPoint presentation in Skype Meeting.
We can’t connect to the server for presenting right now.
Network issues are keeping you from sharing notes and presenting whiteboards, polls, and uploaded PowerPoint file.
Recently I came across issue were multiple users complain that they are unable to upload PowerPoint presentation, access polls and whiteboard etc.
Verified OWA server and Front End server there was no error logged on any of server.
Also OWA and Front end server communicating correctly so there was no port blocked.
I was able to browse https://owa.mydomain.com/hosting/discovery
When checked UCCAPI log and found, error message “Connection to the Web Conferencing Server could be established, but the server terminated”. This was looking like server terminate the connection.
diagHeader>54001;reason="Connection to the Web Conferencing Server could be established, but the server terminated immediately";ClientType=Lync;Build=15.0.4787.1002;ContentMCU="sip:email@example.com;gruu;opaque=app:conf:data-conf:id:VLD0PJ7W";ConferenceUri="sip:firstname.lastname@example.org;gruu;opaque=app:conf:focus:id:VLD0PJ7W";LocalFqdn="ABC-LCY9FG32.mydomain.com";ServerFQDN="ABC-fe1.mydomain.com";ServerPort
When checked updates/patches installed on Lync Front End server found KB3142030
This was the security update for the .NET Framework 4.5.2 in Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2: May 10, 2016.
Uninstalled this updates from Front End server and rebooted server. This resolved the PowerPoint presentation upload, poll and whiteboard issue.
So short story was this KB was affecting PowerPoint presentation upload, poll and whiteboard.