Invalid Web Reference
This error message appears when you try to add a Web reference to a Visual C++ project, but the URL specifies a file with an extension that cannot be used by the project. The URL must reference a file with one of the following extensions:
.disco
.vsdisco
.asmx
.asmx
.wsdl or ?wsdl
You may be able to locate the appropriate file by removing the file name from the address and using just the server and service name in the URL.
See Also
Reference
The proxy settings on this computer are not configured correctly for Web discovery.