punsez138451d/L3NOCALM is not a host name. The authentication was working in the previous post. 
http://punsez138451d/L3NOCALM/default.aspx'

[download]
is short for 
http://punsez138451d:80/L3NOCALM/default.aspx'

[download]
where

The credentials are for the entire host, specified using it's name and it's port.

In reply to Re^12: WWW::Mechanize Problem by ikegami
in thread WWW::Mechanize Problem by venkatesan_G02

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