Tried LWP::Protocol::connect to get over this problem: $userAgent->proxy('https',"connect://my-proxy:8080/"); 500 Bad arg length for Socket6::unpack_sockaddr_in6, length is 16, should be 28 Content-Type: text/plain Client-Date: Wed, 16 Oct 2013 15:46:07 GMT Client-Warning: Internal response Bad arg length for Socket6::unpack_sockaddr_in6, length is 16, should be 28 at /usr/lib/perl5/Socket6.pm line 282, <> line 1.