User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Build ID: 20121024073032 Steps to reproduce: I'm new to Windows 8, and installed Firefox 16.0.2. I'm trying to access a number of company internal websites protected by NTLM Authentication. I also added the domain into network.automatic-ntlm-auth.trusted-uris (.company.com) to enable this, and also switched network.automatic-ntlm-auth.allow-proxies to false. the same Firefox configuration works fine on a Windows 7 system, and Internet Explorer on the same Windows 8 system correctly accesses the NTLM Authenticated sites. Actual results: The Firefox on Windows 8 comes up with a 'Authentication Required: Enter username and password for ...' box. Even entering the correct credentials does not allow accessing these sites. Expected results: Firefox should simply use the logged on users' authentication for the NTLM Authentication request.
Stefan: Do you get the NTLM dialog box over and over again when entering the correct credentials? Then this bug might be a dupe of Bug 779467. The bug fix should be included in Firefox 19 and possibly also in the Firefox 17 extended service release version.
Frank, yes it does. and even though about that other bug you referenced, it pointed me to a solution: my issue was related to the proxy connection to the NTLM-authenticating server. After setting that system name into 'No proxy for', I succeeded, using NTLM authentication. and that's the same behavior as in Windows 7, so there's no regression in Firefox. you can close this bug as user-error.