What is 'NT AUTHORITY\ANONYMOUS LOGON' every 15 secs

[kyosang]

I am a second administrator on a Windows Server 2003 and when I go into Event Viewer then it is showing me Security events 538 and 540 every now and then. Can I stop 'Success Audit....Logon/Logoff....ANONYMOUS LOGON', is it ok or should i just disable this events not to show up? Thanks for any reply.

[kyosang]

I just found out that it is coming from only a single workstation and have been happening from a very long time. Below are its details:

Event Type: Success Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 540
Date: 6/11/2008
Time: 11:59:44 AM
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: MMPA-WS1
Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x37E8C04)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: JUSTIN
Logon GUID: -
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 192.168.1.103
Source Port: 0

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

[Bigga Lexx]

Can you tell us whether this same server happen to be running on ISS web services? If it is so then IIS by default uses this same account for serving up web page requests.