This issue usually occurs because one or more of the following conditions are true:

Verify that the video drivers are up to date and are working correctly. For more information, go to the following Microsoft Knowledge Base article:Ģ409256 You can't connect to Skype for Business Online, or certain features don't work, because an on-premises firewall blocks the connection Make sure that your network meets all the requirements for the best experience with Skype for Business Online. Don't use this step to troubleshoot this issue if you have an Office 365 dedicated plan. This step doesn't apply to Office 365 dedicated subscription plans. If the issue occurs for multiple contacts, check for commonalities among the group of contacts.

If the issue occurs for only one contact, determine whether anyone else can reproduce the issue with the same contact. Try to reproduce the issue by using one contact or multiple contacts. To resolve this issue, follow these steps: The user receives the following error message in Lync 2010 or Lync 2013:Ĭannot start Desktop/Application Sharing due to network issues.Ī message that resembles the following entry is recorded in the Lync UCCP logs: ms-client-diagnostics: 23 reason='Call failed to establish due to a media connectivity failure when one endpoint is internal and the other is remote' CallerMediaDebug='application-sharing:ICEWarn=0x4000320,LocalSite=207.46.5.9:20702, LocalMR=207.46.5.63:54829,RemoteSite=11.1.111.11:62198, RemoteMR=65.55.127.64:51184, PortRange=1025:65000,LocalMRTCPPort=54829, RemoteMRTCPPort=51184,LocalLocation=1, RemoteLocation=2,FederationType=0' However, the participants in the conversation can't connect to the desktop sharing session. A user shares the user's desktop or an application with other participants through Skype for Business Online (formerly Lync Online).

Not able to join skype meeting