Logon/security errors on SBS 2003


Recently, I seem to keep seeing a high influx of logon errors on one of my DC's which look like this:

Service Ticket Request:
       User Name:            emilfolk@domain.LOCAL
       User Domain:            domain.LOCAL
       Service Name:            krbtgt/domain.LOCAL
       Service ID:            -
       Ticket Options:            0x2
       Ticket Encryption Type:      -
       Client Address:  
       Failure Code:            0x20
       Logon GUID:            -
       Transited Services:      -

I'm running an SBS 2003 with a backup DC. These errors all seem to be flagging up on the backup dc and are appearing at all times of the day. Other similar, possibly related errors are:

 Logon account:      paul.cole
 Source Workstation:      UPMWEB
 Error Code:      0xC000006A

Authentication Ticket Request:
       User Name:            sarawait
       Supplied Realm Name:      domain
       User ID:                  -
       Service Name:            krbtgt/domain
       Service ID:            -
       Ticket Options:            0x40810010
       Result Code:            0x17
       Ticket Encryption Type:      -
       Pre-Authentication Type:      -
       Client Address:  
       Certificate Issuer Name:      
       Certificate Serial Number:      
       Certificate Thumbprint:      

I've had a look about on the net and found a few things, but not really a solution or full explanation. It's only really just started happening, but are occuring on a daily basis and I'm getting a little concerned as to what could be causing them. This is also happening with the domain administrator account.

Any help would be much appreciated :)


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