If it handles cookies correctly as you say then why doesn't it work? Because of all the reasons explained in the FAQ , but basically,
because websites still discriminate based on browser identification headers cookies are often set through javascript or web bugs, and mech doesn't javascript or load/GET images, you have to help it do those things
When I run Wireshark I can see it getting a cookie but I don't know how to emulate this in Mechanize.
Have you checked to see if mechanize is already getting this cookie?
Have you checked to see if mechanize is getting that same url?
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