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I'm trying to consume a Webservice already existing and that works perfectly. After having read many tutorials and examples, I finally managed to get an answer from the server: Server was unable to process request. Object reference not set to an instance of an object The WS simply allows you to get and ID from an NT login (one string param, one string answer). Here is my perl script: #!perl -w use strict; use warnings; use LWP::UserAgent; use SOAP::Lite on_action => sub { "$_[0]$_[1]"; }; use LWP::Debug; LWP::Debug::level('+'); SOAP::Lite->import(+trace => 'all'); #use SOAP::Lite +trace => 'debug'; #sub SOAP::Transport::HTTP::Client::get_basic_credentials { return ('user' => 'pwd') }; use Data::Dumper; my $var = SOAP::Data->new(name => 'NTLogin', value => "1234", type =>'s:string'); my $resultLogin = SOAP::Lite -> uri('http://xxxxx') -> proxy('http://yyyyy/zzzzz/directory.asmx') -> on_action( sub { join '/', @_ } ) -> GetUIDFromNTLogin($var); print "lets test it...\n\n"; print $resultLogin; print "\nresult():\n"; print $resultLogin->result(); And here's the output: Launching NT to UID conversion SOAP::Data::new: () SOAP::Lite::new: () LWP::UserAgent::new: () SOAP::Transport::HTTP::Client::new: () SOAP::Lite::call: () SOAP::Serializer::envelope: () SOAP::Serializer::envelope: GetUIDFromNTLogin SOAP::Data=HASH(0x______) SOAP::Data::new: () SOAP::Data::new: () SOAP::Data::new: () SOAP::Data::new: () SOAP::Data::new: () SOAP::Transport::HTTP::Client::send_receive: HTTP::Request=HASH(0x______) SOAP::Transport::HTTP::Client::send_receive: POST http://yyyyy/zzzzz/directory.asmx Accept: text/xml Accept: multipart/* Content-Length: 534 Content-Type: text/xml; charset=utf-8 SOAPAction: http://tempuri.org/GetUIDFromNTLogin <?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:xsi="http://www

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