SBS 2003 : Server Management - Backup and Monitoring snap-in - Cannot connect to localhost/Administrator

The SBS 2003 Server was installed with a blank password.
After changing the password the snap-in Backup and Monitoring prompt for localhost/Administrator password add fail even though it's entered correctly.
If I put the password back to blank the prompt window does not appear and the page displays correctly.
Is there a special way to change the administrator password for this not to happen ?
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Did you change the password from the Server Management screen or from the Add Users and Computers screen?
Have you tried inputting the password with the username as: DOMAIN\administrator ?

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