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We can’t connect to the server for presenting right now.

Issue: Unable to upload or Present PowerPoint presentation in Skype Meeting.
Error message:
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.

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=";gruu;opaque=app:conf:data-conf:id:VLD0PJ7W";ConferenceUri=";gruu;opaque=app:conf:focus:id:VLD0PJ7W";LocalFqdn="";ServerFQDN="";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.

Thank you.


  1. Known issue that all latest clients have fixes for (other than Lync Room Systems):

  2. I see this problem with larger meetings (20+ partipants). If the presenter is presenting a powerpoint presentation, some people can see it and some people get the error above. Has anyone seen this? There is no commonality in terms of network for people that it works and people that it doesn't.


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