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Cannot log in to Lync 2010

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I used the configurator from to setup my desktop apps including Outlook 2010 and Lync 2010.  Outlook 2010 is working great but I cannot login to Lync 2010.  I am getting the "Cannot sign in to Lync.  the user name, password, or domain appears to be icorrect..." pop-up error for every login attempt.


Here are some of the steps I have already taken to fix the issue:


(1) Uninstalled and re-installed Lync 2010 64 bit from several times

(2) Confirmed that Sign In address and User name are the same (

(3) DNS records are correct

(4) Checked access to is OK

(5) Deleted the user licence for Lync, signed out of Admin, waited 1hr then signed-back in to Admin to add Lync licence to

(6) Run Outlook 2010 mailbox Repair wizard

(7) Removed cached sign-in data and credentials (

(8) Tried the server address in "Automatic" mode and tried setting Internal/External to


...but still no success.


please can anyone help?


All Replies
  • Martin,

    Here are some other steps for you to try:

    (1)  Set the user to your domain, wait 1hour, attempt to sign-in with that login

               -  If the above works, we know the user account is correctly setup for Lync

               -  If the above works, set the user back to the vanity domain (, wait 1hour, attempt to sign-in with (

    (2)  If flipping the domain to the domain does not allow you to login

              -  What error are you recieving now?

    Charlie Gaither

    Microsoft Lync Online Support