Kerberos Tickets flushed on unlocking Windows Xp?

[Rahul Kohli]

Hi,
 
I am facing a strange issue with Kerberos authentication on my Windows XP system. I noticed that on lock and unlock Windows XP system all the kerberos TGT and service tickets get deleted and recreated.
 
Is this a Known feature or defect ? Please let me know when does these kerberos tickets get flushed on the lock, or the unlock? 
 
Is there a patch/fix available for this behavior? Can the default locl/unlock behavior be changed for kerberos.
 
Thanks,
Rahul