Alternatively try to access the page with a regular browser. If it pops up with a 'standard' username/password box then make a note of the realm and insert that into your credentials method as the second argument. You may be dealing with a server that requires regular digest authentication.
Popup will have something like this: 
Enter username and password for "realmname_here" at http://...

[download]
Update: btw make sure to append the portnumber (:80) to your fully qualified hostname in argument one, otherwise authentication can fail even with correct credentials.

In reply to Re^3: LWP::UserAgent Authentication by varian
in thread LWP::UserAgent Authentication by palladinob

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