Breaking news that Security Update for .NET Framework (3156757) rated Important breaks internal conferencing for Lync Server 2010, 2013 and Skype for Business users.
The following are known modalities affected by this issue:
- Whiteboards
- Uploading PowerPoint Presentations
- Sharing Notes
- Polls
- Q&A
The error messages that users may receive when this problem occurs include the following:
- 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 Pow…
- An error occurred during the Skype Meeting
This problem occurs because an information disclosure vulnerability exists in the Transport Layer Security protocol and the Secure Sockets Layer protocol (TLS/SSL) as they are implemented in the encryption component of the Microsoft .NET Framework. An attacker who successfully exploits this vulnerability can decrypt encrypted TLS/SSL traffic.
This vulnerability is fixed by the security update that’s discussed in Microsoft Security Bulletin MS16-065. This update changes the way that the .NET Framework encryption component sends and receives encrypted network packets.
The changes that are introduced in this security update affect how Skype for Business, Lync, and Lync for Mac desktop clients communicate together with the Web Conferencing Service on the Front End and Standard Edition servers. These changes cause the problems that are mentioned in the “Symptoms” section.
Microsoft have released a KB with some workarounds here
Thanks a lot! You saved my day!
glad it was useful :-)
Aided me a lot, just what I was looking for : D.
Hey Tom,
I would like to thank you a lot ! I was really thinking about rebuilding completely my S4B environment as this issue starting to drive me crazy !!!
I would just like to said that on my FE, this security update wasn’t installed so the key “HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework\v4.0.30319\System.Net.ServicePointManager.SchSendAuxRecord”
Anyway, I tried the fix and it worked just after I restarted the WebConferencing service !
Thanks again
Julien
Glad it was useful!
cheers
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