Friday, October 31, 2014

Lync server is temporarily unavailable-Error



Symptoms
Lync client shows the error message 'Cannot sign in because the server is temporarily unavailable. If the problem continues, please contact your support team.' on try to sign in

Cause

If both custom and automatic configuration methods do not work, the client firewall settings may be the reason of the problem.

Resolution

Check that the following ports are open for outbound connections on the client side:
Port
   Protocol
443
  TCP (TLS)
443
  TCP (PSOM/TLS)
443
  TCP (STUN/MSTURN)
3478
  UDP (STUN/MSTURN)
5061
  TCP (MTLS)
 

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