- Lync 2013Can't sign in to Lync
Cannot sign in to Lync because your computer clock is not set correctly. To check your computer clock settings, open Date and Time in the Control Panel.
- Lync 2010Cannot sign in to Lync
The user name, password, or domain appears to be incorrect. Ensure that you entered them correctly. If the problem continues, please contact your support team.
- Lync for Mac 2011Either date and time settings are incorrect, or the digital certificate file is not valid or installed on your computer. If date and time are correct, see your network administrator to verify that your digital certificate file is valid...
To determine whether a time skew is the cause of the issue, check whether the ClockSkew DWORD value is present in the following registry subkey:
If the ClockSkew DWORD value is present, this is most likely the cause of the error message. A value of 300 represents a five-minute time difference, and this can cause the sign-in issue.