Error Description:WSDL Reader:Loading of the WSDL file failed.HRESULT=0x80040154.

The application that one of our clients is using is giving this error when it is trying to access a web service. This client is in a different geographical location(continent). We are in the U.S and we are able to access the web service just fine using that application.The server is in the U.S. I suspect, it might be some security related issue that is stopping this, but i may be wrong. Any suggestions in regards to this would be very helpful. Thanks in advance.