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Problem

I have a Windows domain user account that gets automatically locked-out semi-regularly.

Troubleshooting Thus Far

The only rule on the domain that should automatically lock an account is too many failed login attempts.

I do not think anyone nefarious is trying to access my account. The problem started occurring after changing my password so I think it's a stored credential problem. Further to that, in the Event Viewer's System log I found Warnings from Security-Kerberos that says:

The password stored in Credential Manager is invalid. This might be caused by the user changing the password from this computer or a different computer. To resolve this error, open Credential Manager in Control Panel, and reenter the password for the credential mydomain\myuser.

I checked the Credential Manager and all it has are a few TERMSRV/servername credentials stored by Remote Desktop. I know which stored credential was incorrect, but it was stored for Remote Desktop access to a specific machine and was not being used (at least not by me) at the time of the warnings. The Security-Kerberos warning appears when the system was starting up (after a Windows Update reboot) and also appeared earlier this morning when nobody was logged into the machine.

Clarification after SnOrfus answer:

There was 1 set of invalid credentials that was stored for a terminal server. The rest of the credentials are known to be valid (used often & recently without issues). I logged on to the domain this morning without issue. I then ran windows update which rebooted the computer. After the restart, I couldn't log in (due to account being locked out). After unlocking & logging on to the domain, I checked Event Viewer which showed a problem with credentials after restarting.

Since the only stored credentials (according to Credential Manager) are for terminal servers, why would there be a Credential problem on restart when remote desktop was not being used?

Question

Does anyone know if Windows 7 "randomly" checks the authentication of cached credentials?

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2 Answers

No, this isn't the case. What I suspect might be wrong is that you still have previous credentials stored. Try removing the stored credentials from Credential Manager, and then connect and log on to the domain (this will re-cache your credentials).

Afterward there shouldn't be any problems.

Note: There are also methods that your sysadmin could be using to expire cached credentials, but that doesn't seem to be the case here. You might want to ask, just in case though.

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Understood that there was an invalid credential stored. But it was stored for terminal server access... why would it be checked on startup? I've deleted it to alleviate the lock-out issue, but the root of the problem still confuses me. –  Farray Apr 15 '11 at 17:36
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Some credential issues can be tied to invalid time settings and kerberos. Check the machine hes running and make sure its got the right time. If not, run w32tm /resync It might help.

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To expand on this: Running NET TIME will also tell you what source the client is using to update the time. It SHOULD point to your AD server –  Canadian Luke Apr 3 '12 at 18:53
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