Tuesday, January 11, 2011

Unable to sign into Lync with MOC client (Windows XP and 7)

I came across an interesting problem recently where some Windows XP and Windows 7 clients running Communicator 2007 R2 couldn't sign in over a Lync 2010 Edge server. We had migrated our environment from a 2007 R2 Edge to a Lync Edge server and all Lync 2010 clients were fine.

After making a few calls and doing some research I found this article: http://blog.tiensivu.com/aaron/archives/1917-OCS-2007,-NTLM,-and-Edge-server-login-problems.html

As it turns out we had to disable the requirement for 128-bit encryption on the Edge and Front-End Lync 2010 servers for it to be resolved. No reboot was required. See the above link for instructions on how to do so.

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