Unable to connect remote server

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ASP.NET

Hi All,

I developed one project for sending sms.

It worked properly when I ran it in local iis, but when I uploaded the project in my hosting server and sent the message using web page, I got an error:

System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A socket operation was attempted to an unreachable host 174.123.206.215:80
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetResponse()
   at sendSMS.Button1_Click(Object sender, EventArgs e)  

Please help me with proper solution.
Thank you all in Advance.