Consuming a web service on a .net smart device application

I am trying to consume a web service locally on a .net sma开发者_StackOverflow社区rt device application and getting this error:-

System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it

Any suggestions..

Probable causes:

1. Your emulator do not allow the connection
2. The server is really not responding
3. A firewall prevents the connection