At least I get no 404 error for the URL when I paste it into my browser.

Maybe you want to print out more stuff while your program runs, and use LWP::Debug to see what actually happens? If the server is giving you a 404 but not other people, maybe the server administrators have banned your IP address, your user agent or some other attribute associated with you.

In reply to Re^3: Problem with HEAD.. but I think can be related with DNS by Corion
in thread Problem with HEAD.. but I think can be related with DNS by angeloulivieri

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