Problem: The SOCKET_HOST_NAME_NOT_FOUND 10050 error appears on the console or in the log files.
Solution 1 (iOS): 
- Navigate to the Settings application on the device.
-  Click on the corresponding application tab.
- Confirm that the connection information is correct.
Solution 2 (Windows Mobile):
- For Windows Mobile, if you are  using an emulator for testing,  confirm that you have synchronized  the emulator first. 
- Confirm that  dblgen11.dll  is in your C:\Inetpub\wwwroot\ias_relay_server\server\ folder.
- Confirm that the RSOE version is less than or equal to the relay server version.