If you get Client-Warning: Internal response, then LWP never talked to the remote server.
So, there is an issue that A.B.C.D does not listen on 8443 from your host. Maybe you need a proxy.
I would first debug the TCP connection from the client to the server on port 8443, by trying with another HTTP client like wget or curl.
In reply to Re^3: XML Parsing issue with SOAP::Lite (xml declaration)
by Corion
in thread XML Parsing issue with SOAP::Lite (xml declaration)
by erwanhumez
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