XML Feed works fine in dev but Error in production...?

Hi, I'm getting the weather info thru XML feed from national weather service for my web application. 
It works fine on the my development machine.  but got this errors when running off from the production environment..
anyone has any idea or suggestion?
 
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond xxx.xx.xx.x:xx Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Net.Sockets.SocketException: A connection attempt failed ...