Sometimes or very often you notice that you are prompted for login credentials aka Username & Password when you browse http://Your-WSUS-Server/WSUSAdmin. You might wonder why it repeatedly prompts for the login.
This is by design & to remedy this, you might want to add http://Your-WSUS-Server/WSUSAdmin to “Local Intranet” Zone from Internet Explorer – Tools – Options – Security – Local Intranet – Sites – Advanced – Add this website to the Local Intranet Zone.