Wednesday, January 4, 2012

Intermittent OCS login issue

Intermittent OCS login issue for Win7 Systems
Some of our remote users reported me that they were not able to login into OCS from Win-7 PCS. The error was
“Cannot sign in to Communicator.  You may have entered your sign-in address, user name, or password incorrectly, or the authentication service may be incompatible with the version of the program.  If your sign-in information is correct and the problem persists, please contact your system administrator”
Later I collected the communicator logs from the user system and I found the below line in the snooper window
“ms-diagnostics: 1013;reason="Significant time skew detected during authentication";source”

I found one DC which is recently added to the AD infrastructure which is having time difference more than 5 Min with respect to other DCs in the AD environment. I rectified it and resolved the issue
This is office communicator Authentication issue, time skew of more than 5 minutes break Kerberos authentication.

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