Skype for Business login fail

lync office365-apps skype-for-business
Pradeep Patel picture Pradeep Patel · Sep 22, 2015 · Viewed 21.7k times · Source

I'm using https://testconnectivity.microsoft.com to run a test connection to the Skype for Business (Lync) server but I keep getting a failed test connection.

Couldn't sign in. Error: Error Message: No common authentication method detected.. Error Type: AuthenticationException. Error Code: 0. Realm: SIP Communications Service. Response Code: 401. Response Text: Unauthorized.

The suggestions on how to resolve have so far not helped, any ideas what I could try or has anyone successfully resolved an issue like this before?

Answer

Pradeep Patel picture Pradeep Patel · Sep 23, 2015

Issue was resolved after entering the following DNS entries. 2 CNAME and 2 SRV entries were added.

Added 2 CNAME records, which were for "sip" and "lyncdiscover".

sip, CNAME, sipdir.online.lync.com.

lyncdiscover, CNAME, webdir.online.lync.com.

Added 2 SRV records, which were for "_sip._tls" and "_sipfederationtls._tcp".

_sip._tls, 100, 1, 443, sipdir.online.lync.com.

_sipfederationtls._tcp, 100, 1, 5061, sipfed.online.lync.com.

After doing this I was able to log into Skype for Business successfully.

The other option, which will only work per client is to enter the server and ports in manually in Skype for Business.

  1. Go to Tools-Options.
  2. Go to Advanced Connection Settings.
  3. In here check "Manual Configuration".
  4. For Internal server name enter "sipdir.online.lync.com:443".
  5. For External server name enter "sipdir.online.lync.com:443".
  6. Click on OK and proceed to log in.

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