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Administrator password stops working

At random times, the AD administrator password stops working. We have another administrative account we use to login to the domain and change the administrator password back to something that will work. Within a little while, the administrator password stops working again.
Each time we login under the other administrative account, we reset it, and it will work again for a while.
Any ideas why this may be happening? We don't show anything in the event logs that seems to indicate a problem.
Thanks in advance for your help.
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2 Solutions
Do you keep changing the password back to the same password?  It is possible that someone has the password and keeps changing it.  If this is not the case, scan your system for a root kit.  McAfee and Norton AntiVirus have this scan capability, other virus scanners probably do to.
This might help you find the root kit without purchasing anything:


Also be sure to check the server for rogue accounts that might have been created.  Someone might have created an account and placed it in the administrator group, audit the group to assure only the proper users are members.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Install the Account Lockout and Management Tools

then, next time it happens, check the account for more clues.
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