NT AUTHORITY\ANONYMOUS LOGON type 3

I got the following message on Event Viewer and I know that type 3 is user from network logged. Is that critical? If yes, is there a way to block it?

Event Type: Success Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 540
Date: 6/17/2004
Time: 4:30:00 PM
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: LAPHOME
Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x12E3D)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name:
Logon GUID: {00000000-0000-0000-0000-000000000000}

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

You could turn on your firewall..
With Pro version there are some local security policy
settings you can use to impact null session / anonymous
login.

--
Roger Abell
Microsoft MVP (Windows Server System: Security)
MCSE (W2k3,W2k,Nt4) MCDBA
"GuigoCLT" <GuigoCLT@discussions.microsoft.com> wrote in message
news:E77F0306-1889-4A8A-A4D4-C51678FB03B6@microsoft.com...
> I got the following message on Event Viewer and I know that type 3 is user
from network logged. Is that critical? If yes, is there a way to block it?
>
> Event Type: Success Audit
> Event Source: Security
> Event Category: Logon/Logoff
> Event ID: 540
> Date: 6/17/2004
> Time: 4:30:00 PM
> User: NT AUTHORITY\ANONYMOUS LOGON
> Computer: LAPHOME
> Description:
> Successful Network Logon:
> User Name:
> Domain:
> Logon ID: (0x0,0x12E3D)
> Logon Type: 3
> Logon Process: NtLmSsp
> Authentication Package: NTLM
> Workstation Name:
> Logon GUID: {00000000-0000-0000-0000-000000000000}
>
> For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
>