On the computer on which the BIM Server is installed, you can go to the BIM Server Control Center and start the BIM Server Manager from there. Then you can manage the BIM Server from there, no password needed.
Then you can go the your User Settings and change the password.
The idea is that if you can log in to that computer than you are an authorized person to manage the BIM Server as well.
On the other hand, if you start a BIM Server Manager from another machine you will need the password to be able to administer the BIM Server.
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