There is JavaScript in that page, but all it does is auto-submit the embedded form containing the challenge and response. I've never had to do this so I don't know for certain it will work, but if you can use the "submit" method in WWW::Mechanize to submit the form presented right back at the server, that should get you logged in.

In reply to Re^2: LWP::UserAgent vs. NTLM Challenge/Response by bigmacbear
in thread LWP::UserAgent vs. NTLM Challenge/Response by jpk236

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