Try setting your User-Agent string to the same thing Firefox sends.

As keszler notes, you need to capture what works. I like to use the paros proxy for capturing http traffic.

Update.... Oh Dang my brain is just catching up with my fingers. How can one use a proxy to debug another proxy? Paros can forward traffic to a second proxy but I don't know if the authentication will work then.

In reply to Re^2: Proxy authentication using NTLM? by gmargo
in thread Proxy authentication using NTLM? by Preceptor

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