Solved!
I'm not sure why the syntax below doesn't work but to fix it I put the username and password in the proxy URL like so...

I am trying to use SOAP::Lite to connect to a SOAP api that requires HTTP auth but I can't seem to get it to work and I have no idea how to debug this!

This is what I'm trying to do...

#!/usr/bin/perl

use strict;
use SOAP::Lite;

my $soap = SOAP::Lite->new(
            proxy => [
                'https://<host>:<port>/<path>',
                'credentails' => [
                    '<host>:<port>',            # host:port
                    'My Realm',                 # realm
                    'username',
                    'password'
                ]
            ]
        );
my $som = $soap->RetrieveList();
die $som->faultstring if ($som->fault);
print $som->results, "\n";
[download]

This is what I get for output...

401 Unauthorized at test.pl line 25.
[download]

The documentation, if you can call it that, for SOAP::Lite has been of no help. Anyone know what I am doing wrong?