From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.1+) Gecko/20010607 BuildID: 2001060704 Type in bogus username "test" password "test". IE generates an invalid login popup and redirects to a different login page. Mozilla redisplays the same page with no popup. When a valid username and password are entered in Mozilla, a page with the following message is displayed: Not Found The requested object does not exist on this server. The link you followed is either outdated, inaccurate, or the server has been instructed not to let you have it. Please inform the site administrator of the referring page. This site is unusable with Mozilla. Reproducible: Always Steps to Reproduce: 1. Type valid or invalid username/password combination and click go. Results: 1. Invalid user/pass redisplays the same page (See IE for correct behavior) 2. Valid user/pass displays an erroneous "NOT FOUND" page.

probably bug 83625

*** This bug has been marked as a duplicate of 83625 ***