There is nothing anyone can do to help you with unknowable server, unknowable wsdl, and unknowable error -- 500 means generic somethings wrong, useless for making suggestions

I gave you my SOAP debugging tips, try to apply them, then you'll have some idea where you're going wrong with the SOAP request you're sending

Maybe this short SOAP::Lite tutorial can help you How to Call a .NET-based Web Service Using the SOAP::Lite Perl Library

SOAP::Lite WSDL support is easily broken, SOAP is very painful (I hate it), but it appears you're forced to deal with SOAP, so I urge you to switch to XML::Compile