I'm using Mozilla for Windows in a Windows2000 computer. Our Proxy is an ISA Server Proxy and in the user validation it asks for Username, Password and Domain. If i try to view an internet page it gives this error: HTTP 407 Proxy Authentication Required - The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied. (12209) But it doesn't show the login window. I have seen that in other browsers like opera the error is the same. It only works with IE.
*** This bug has been marked as a duplicate of 35159 ***