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Windows 2003 Event Viewer > Security > Failure Audit > Event id 537

Event Type:      Failure Audit
Event Source:      Security
Event Category:      Logon/Logoff
Event ID:      537
Date:            3/16/2011
Time:            7:18:05 AM
User:            NT AUTHORITY\SYSTEM
Computer:      SERVER
Description:
Logon Failure:
       Reason:            An error occurred during logon
       User Name:      
       Domain:            
       Logon Type:      3
       Logon Process:      Kerberos
       Authentication Package:      Kerberos
       Workstation Name:      -
       Status code:      0xC000006D
       Substatus code:      0xC0000133
       Caller User Name:      -
       Caller Domain:      -
       Caller Logon ID:      -
       Caller Process ID:      -
       Transited Services:      -
       Source Network Address:      10.0.1.4
       Source Port:      17981


I have 19 occurences within last 72 hours

10.0.1.4 detected as  Netgear,In:00:AF:09

I have only one NetGear product in the network and that would be Neatgear Prosfafe VPN Firewall FVS318, which I used to make an extra connection for a PC without ethernet jack


So what's going on here?

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ASKER

Verified, the MAC address is the one of the device mentioned above
source port varies from entry to entry
18276
17981
17924
0
18429
17982
17976
18381
18384
18373
17930
18303


which falls into range of 17924-18429, which is not of any known allowed services listed on router.

-noticed that the router password was set as default, changed

Do you have a mix of 2003 & 2008/R2 domain controllers?
no, in this scenario theres only one DC and its running 2003 SP2
Are the user, workstation, and domain names actually blank like that?  Is there a consistent time interval between the errors or are they pretty random?  (sorry I only have questions at the moment)
ASKER CERTIFIED SOLUTION
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IT-Monkey-Dave
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