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Failed Login Event ID 529

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Failed Login Event ID 529

Postby aisaacs.theritegroup » Thu Aug 28, 2014 1:38 pm

Just curious if anyone has ran across this before. Labtech is reporting that there are failed logins being reported on the Primary DC. Full ticket details are below. I found this for Logon Type 3:

Logon Type 3 – Network

Windows logs logon type 3 in most cases when you access a computer from elsewhere on the network. One of the most common sources of logon events with logon type 3 is connections to shared folders or printers. But other over-the-network logons are classed as logon type 3 as well such as most logons to IIS. (The exception is basic authentication which is explained in Logon Type 8 below.)

I also found this definition for NtLmSsp: NTLMSSP (NT LAN Manager Security Support Provider) is a security support provider that is available on all versions of DCOM.

I'm not entire sure, but /seems/ like perhaps someone is trying to access a share on his machine? It seems like an automatic process. I can't find anything in any of the logs of that laptop that correspond to the times listed in the security log on the domain controller.

Any suggestions would be greatly appreciated.



Found Failed Logins: Logon Failure:
Reason: Unknown user name or bad password
User Name: Robin
Domain: RobinDELLLaptop
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address:
Source Port: 60105
Posts: 6
Joined: Thu Jul 17, 2014 1:05 pm

Re: Failed Login Event ID 529

Postby mmontecalvo.labtechsoftware » Tue Sep 02, 2014 10:36 am

Hello Angela,

Unfortunately there isn't much guidance we can give you on this one. LabTech is simply reporting what is in your Windows Event logs on your DC. As for what your course of action is or how to track down what/who is trying to login we can't help with that at all.

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LabTech Support Engineer
LabTech Support Engineer
Posts: 5
Joined: Tue May 06, 2014 9:30 am

Re: Failed Login Event ID 529

Postby mike.surefireit » Mon Dec 26, 2016 2:50 pm

The event log is telling you exactly who is trying to access the DC with incorrect credentials:
User Name: Robin
Domain: RobinDELLLaptop
It is also telling you the address and port:
Source Network Address:
Source Port: 60105

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Joined: Wed Sep 28, 2016 8:16 pm

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