A page not found error is returned for a Mashup Service request

Cognos® Mashup Service requests may return a page not found error.

There are two possible solutions for this error as explained here:

• Ensure that the Gateway URI in IBM® Cognos Configuration is set to the name of the server and not to localhost.
• If you are using the path or searchPath source types, try using the report source type. If this works, the path or searchPath you tried may have been incorrect.