Cant sign in Skype for Business


The following error is displayed when launching Skype for business

      Can't sign in to Skype for business – The server is temporarily unavailable. If the problem continues, please contact your support team.


This issue maybe caused (in my case) due to the firewall blocking sipfed.online.lync.com:5061

https://technet.microsoft.com/en-us/library/gg398833.aspx

You can test to see if the port is open or closed using telnet.


A successful test will look as follows:-




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