Exchange Computer account is expired

We are getting Warning Event ID 40960 on Exchange Mailbox server: Exchange 2010 SP3 CU2

The Security System detected an authentication error for the server ldap/DC002.domain.local. The failure code from authentication protocol Kerberos was "The user's account has expired.

It is coming for all DCs in particular site.

Any idea?
LVL 19
Amit KumarAsked:
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Adam BrownSr Solutions ArchitectCommented:
That seems to suggest a user attempted to log in to the server (or OWA, or through Outlook) using an account that was set to expire and has passed its validity period. If you examine your Security log for login failures, you should be able to determine which account is attempting login.

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Amit KumarAuthor Commented:
Tried to check filter security logs but did not find any login failure attempt during that time.
Adam BrownSr Solutions ArchitectCommented:
Your audit policy may not be set to check for failures. The default is to only record successful logon events. Also, for domain accounts, you would check the security logs on the Domain Controllers, rather than the Exchange server.  If the audit policy settings for the domain/exchange server are set to default, you won't be able to get any info on the account that is having issues, since there is no way to record failed attempts. You can set the policy now and wait for the event to occur again and go from there, though.
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Amit KumarAuthor Commented:
Auditing is enabled for Failure also, will check logs on DC also.
Amit KumarAuthor Commented:
Found one user who has left our org and account was disabled for him. But he left his RDP session on impacted server.
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