The operating system manages this password (not the administrator), and it changes the password every seven days. But problems can arise if the OS can't change the password on your computer. This can happen if you don't connect your machine to the network for seven days.
For example, say you take your laptop with you on a 14-day business trip. When you come back, you won't be able to log in because your computer didn't receive the new password.
If your computer doesn't receive the new password, follow these steps:
You can also disable the automatic password changes. You have three options: from the client side, from the server side, or from both.
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To disable automatic password changes on the client side, open the Registry Editor by going to Start | Run and typing regedt32.exe. Navigate to the following key:
Change the DisablePasswordChange registry entry to 1. You must make this change on each computer where you want to prevent automatic password changes.
To prevent automatic password changes on the server side, open the Registry Editor, and navigate to the same key. Change the RefusePasswordChange registry entry to 1 on all domain controllers in the domain. Make the change to the backup domain controllers first and then to the primary domain controller.
Note: Editing the registry is risky, so be sure you have a verified backup before making any changes.