Event 2510 appears every 12 minutes in Server 2003 DC system log



The following warning event 2510 has suddenly starter appearing exactly every
12 minutes in my Windows Server 2003 DC system log:
"The server service was unable to map error code 1355"

at the same time as this, four entries appear in the Security log:

(1) NT AUTHORITY / ANONYMOUS LOGON Sucess A Event ID: 540
Succesful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x63DDBDB)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: OFFICE
Logon GUID: -
Caller User Name: -
Domain: -
Logon ID: -
Process ID: -
Transited Services: -
Source Network Address: 192.168.0.13
Source Port: 0

(2) NT AUTHORITY / ANONYMOUS LOGON Sucess A Event ID: 538
User logoff:
User name: ANONYMOUS LOGON
Domain: NT AUTHORITY
Logon ID: (0x0,0x63DDBDB)
Logon Type: 3
(3) and (4) are duplicates of (1) and (2), ecept with a different logon ID

The client referred to in the event is running Windows XP. The events stop
as soon as this client computer is turned off.

If anyone has an idea what might be causing this, please get in touch!
.



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