Hello all, Atm we are trying to deploy smart card logon with a 3rd party ca. I have followed all the guidlines from Microsoft about implementing smart card logon with a 3rd party ca as described here http://support.microsoft.com/kb/281245 Atm we have a mixed enviroment with domain controllers Windows Server 2003 and Windows Server 2008. The certificates are ok as it seems from the logs and yet when i present the PIN i get the following error The system could not log you on. The server authenticating you reported an error (0xC00000BB). You can find further details in the event log. Please report this error to the system administrator. and in event view i get the following. Failure Information: Failure Reason: An Error occured during Logon. Status: 0xc00000bb Sub Status: 0x0 Any Ideas? I have checked also one possible reason and the sAMAccountName is exactly the same as the userPrincipalName

Please check KB891849 http://support.microsoft.com/kb/891849 and verify the user certificate has the basic requirements for smart card logon outlined by this TechNet article http://technet.microsoft.com/en-us/library/ff404293(WS.10).aspx /Hasain

Hello Hasain, thank you for your answer. Yes the certificate of the user comply with these requirements.