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IIS Security - Event ID 531

Posted on 2011-04-27
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Medium Priority
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Last Modified: 2012-06-22
I have one SBS 2003 that is being hit heavily with below:

Reason: Unknown user name or password
User Name: <random>
Domain:
Logon Type: 3
Logon Process: advapi
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name: <SERVER>
Caller User Name: <SERVER$>
Caller Domain: <DOMAIN>
Caller Logon ID: (0x0,0x37)
Caller Process ID: 1664

The process that is referenced is inetinfo.exe.

I have searched forums and the only answer I see is that this is all a part of having an internet address. I have my network behind a router/firewall device with various ports forwarded through for SMTP-25, RDP-13389, RWW-443. I do not see the same issue on any other server I have on other networks, so I want to investigate further and perhaps attempt to block these attempts.

We do have a strong password policy internally, but seeing 5000+ attempts within a 24h period seems a bit much.
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Question by:Flipp
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7 Comments
 
LVL 34

Expert Comment

by:Shreedhar Ette
ID: 35480416
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LVL 6

Author Comment

by:Flipp
ID: 35480432
Correction: Event ID 529.

I have seen this previously answered question, but does not look to present a way to lockdown further or troubleshoot beyond.
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Expert Comment

by:Shreedhar Ette
ID: 35480476
Please post the event id 529 description.
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LVL 6

Author Comment

by:Flipp
ID: 35480519
Reason:      Unknown user name or bad password
User Name:      111111
Domain:       
Logon Type:      3
Logon Process:      Advapi
Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name:      SERVER01
Caller User Name:      SERVER01$
Caller Domain:      DOMAINNAME
Caller Logon ID:      (0x0,0x3E7)
Caller Process ID:      1664
Transited Services:      -
Source Network Address:      -
Source Port:      -
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Accepted Solution

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Shreedhar Ette earned 2000 total points
ID: 35480586
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LVL 6

Author Comment

by:Flipp
ID: 35480678
Looks great - thanks shreedhar. I will process this and come back to you in a few days.
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Expert Comment

by:Tolomir
ID: 36902114
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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