I would 1) set the user-agent string in perl script to be the same as your browser's, 2) remove ignore_discard, 3) Dump all cookies irrespective of domain/url (re: get_cookies()).

Might be irrelevant but note that LWP::UserAgent, by default, follows re-directs (e.g. 301, 302) unless you say so, for certain operations (search for max_redirect and requests_redirectable in its doc).

Note, you have a password in your post