The occurrence of this error has been reducing gradually from 4 times in a day to once in 2 days now. but i found a workaround.

Whenever a disconnection occurs, I force-restart the SMPP client with default values loaded and force a connection in 3 seconds.

Its works for now!

How do i solve this error

2:39:44 PM: Exception:System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
at ALT.SMS.SmppClient.kbhdt2w9C(IAsyncResult )
2:39:44 PM: SmppClient disconnected ...