Warnings in eventlog. KDC Event ID: 20

From: Sadretdinov Vadim (vadim_at_cnit.ssau.ru)
Date: 04/16/04 

Date: Fri, 16 Apr 2004 15:26:11 +0500

Hello!
On W2003AS in eventlog I getting the following warning every few hours:

Event Type: Warning
Event Source: KDC
Event Category: None
Event ID: 20
Date: 15.04.2004
Time: 10:17:30
User: N/A
Computer: MORFEUS
Description:
The currently selected KDC certificate was once valid, but now is invalid
and no suitable replacement was found. Smartcard logon may not function
correctly if this problem is not remedied. Have the system administrator
check on the state of the domain's public key infrastructure. The chain
status is in the error data.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

What is wrong? And how correct this trouble?
Thanks!

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