Error on web service implementation in ruby on rails

[Magudamudi]

Hi,

My code is

    require 'soap/wsdlDriver'
    w = "http://www.webservicex.net/CurrencyConvertor.asmx?WSDL"
    soap = SOAP::WSDLDriverFactory.new(w).create_rpc_driver
    result = soap.ConversionRate(:FromCurrency => "USD", :ToCurrency =>"CAD")
    puts result.conversionRateResult
 

This shows the following error

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. - connect(2)

Any one help me why this error occurs...

The problem resides in the following line

    soap = SOAP::WSDLDriverFactory.new(w).create_rpc_driver
 

how can we overcome this error!!

Thanks in Advance!