AD Account is getting locked out constantly

My user account gets locked out constantly.  I ran the MS lockout tools and could see the account getting locked out.  I also ran the other tools EventcombMT and found a device with my name on it to be the culprit with an IP address.  When I pinged that IP address, it came back with the device and the device name was mine.  I looked in Active Directory computers and that device is not a computer listed.  My computer is listed with the correct computer name.  How do I find this rouge computer that is trying to log on and authenticate; thus locking out my account?  I killed the DHCP lease to kick the computer off; but how do I find it?
SalongeAsked:
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NVITCommented:
Do you have a scheduled task trying to run with an expired password?
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SalongeAuthor Commented:
No, i don't.
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Will SzymkowskiSenior Solution ArchitectCommented:
When you are dealing with Account Lockout I would definitely recommend downloading Lepide Auditor for Active Directory. Free trial.
http://www.lepide.com/lepideauditor/active-directory.html

You need to make sure that the following steps are done first before the software will work properly.

- Ensure that you have Audting Enabled on the Default Domain Controllers Policy
- Increase the Security Logs on all Dc's to 1GB
- make sure that you have an account that has domain admins privs to allow access to the logs on the DC.

You can install this software on a member server or a workstation and when you run the reports it will provide all of the info needed and exactly where the account is being locked out on.

Will.
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SalongeAuthor Commented:
This tool will not download.  I have found the name of the device, it is just not mine and not a member of our domain.  It has a pingable ip on our lan.
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realtimeitCommented:
Do you have managed switches? If so, determine the mac address of the offending device  by:
1. ping the device
2. run arp -a, in the cmd prompt. this will show mac addy of each IP that your computer has talked w/ lately.

Then, look for the switch port that is showing that MAC as connected. Numerous ways you accomplish this, depending upon what type of switch you have.

From there, and hopefully your patch panel is labeled, you should be able to figure out where the other end of the cable is.

Alternately, ask everyone to shut down their computers one evening, then see what ports are lit and ping the offending device while unplugging one lit switch port at a time until you identify it.

I had a problem w/ one client whose account locked out once a week (monday am of course). Turned out waaaayyyy in the past she has setup a local backup on a windows computer using her domain creds to run the scheduled task (w/ an old pw). Like a trooper, every sunday evening that computer tried to run a backup.
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SalongeAuthor Commented:
I was able to find the Mac address and blocked it. I will see who is unable to get on tomorrow.
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