WPB Manager > Admin > Server Installation - which userid?

Hi Chaps,

I'm trying to upgrade a WPB installation and one of the pre-requisites is to note the existing database name in the manager via

Administration > Server Installation

I am logged in as userid admin, yet I get a Windows authentication box whilst is tries to go to

http://<hostname>:8080/myManager/server_install_wizard.html

None of the users I can think off will bring back any results, just a blank screen.

Any ideas?

thanks,

Graham