Firefox Asks For Username/password On Every HTTP Request With Digest Authentication Enabled On IIS6

Nov 12, 2010

I've recently enabled Digest Authentication on an intranet website/application I am creating for my company in ASP.NET.

The reason I have done so is because Windows Authentication seemed to only work for some users, and not for others. I could not figure out why nor do I know enough about IIS to try and trace the issue. After some trial and error, I found that digest authentication seemed to give me the behaviour that I wanted. That is: allow only users with a valid account on the domain to log in to the website with their credentials.

The problem now, is that Firefox (3+) seems to ask for the user to authenticate on every HTTP request sent to the server. This does not appear to occur in Internet Explorer (6+) or Chrome.

I've tried searching for solutions but I always arrive at dead-ends. I'll find a discussion about the issue, and every posted solution leads to a dead link...or it's on Experts Exchange and I don't have access to view to solution.

The issue appears to be related (from what I've read) to the way the different browsers send their authentication headers vs how IIS interprets them. I'm not sure what I can do to change this though? One of the solutions I had found mentioned writing an ISAPI filter to fix this, but of course the link to the finished filter was broken and I have no idea how to go about making one myself.

I've tried messing with the NTLM and other auth related strings in about:config to try and force Firefox to trust my server but that doesn't seem to work either.

From a few other sources I've read, it appears that everything should work if I switch back to Windows Authentication, but then I'm back at square one where the authentication would work only for some users and not others.

A solution for either problem would work for me, but I have very little information for the Windows Authentication issue. If someone could guide me through tracing the problem I'd gladly post more information for it as well.

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