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In my office workstation installed with Windows Vista, it logs out and goes to password prompt after 15 mins of idle time, as configured in my screen-saver settings.

In the password prompt, the password does not seem to match up with the corresponding user name and domain and says "Invalid username/password".

Whats wrong here? I can login after reboot, and do manual logout and login, with the same password against my username/domain configuration.

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Your office network use a domain? In that case make sure that you are using a domain account instead of a user account.

For example, if you computer is named DESKTOP6 and the domain is OFFICE make sure that the full username is OFFICE\USERNAME instead of DESKTOP6\USERNAME (the login dialog usually shows the full user name below the input boxes).

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