Hi Team, I am getting the following error while login using smart card (connecting through mstc). "The Kerberos protocol encountered an error while validating the KDC certificate during logon through smart card" Any pointers to resolve this issue will be highly appreciated. Regards, Rohit

Hi, I would like to confirm that did you change any configuration before the issue began? You need to make sure that the Domain Controller certificates are not expired or revoked and the smard card certificates are issued by a trusted CA and not expired. You may use the Certutil utility to check. For more information about how smart card logon and authentication, for the detailed information about how to troubleshoot the smart card logon and authentication issue, please refer to the following MSDN blog: Smart Card Logon and Authentication http://blogs.msdn.com/b/windowsvistanow/archive/2008/03/26/smart-card-logon-and-authentication.aspx Regards, Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.