Call Web service on other network

Hello

In my rails application I am trying to call a web service wich is on
other machine and other network.
Here is the code:
begin
factory_chgst = SOAP::WSDLDriverFactory.new(“http://148.110.139.26/
mywebservice/services/Message?wsdl”)

rescue
puts e.message
end

An error occurs on the SOAP::WSDLDriverFactory.new line. The error
message is: “no element found”.
When a type the URL on IE, I can see the wsdl, so the URL is correct
(we have a VPN configured to the communication between the 2
machines).

When, with the same code I try to call the same web service but on a
machine of the same network, there is no problem:

begin
factory_chgst = SOAP::WSDLDriverFactory.new(“http://mymachine:8080/
mywebservice/services/Message?wsdl”)

rescue
puts e.message
end

Anyone can help me about this problem?

Thanks