Have you looked for where error logs are kept on the server? Odds are extremely good that, regardless of what happens on the client side, your die message will be there.
Comment on Re: SOAP::Lite X.509 certificates, mod_ssl and die
Yes that is true but in the effort to make the function calls as transparent as possible it would be really nice if die's actually worked the way they are suppose to.
As a side I actually modified SOAP::Server such that warn's would work properly as well. All in the effort to improve transparency.