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Target machine actively refused it

After upgrading DBAmp from V2.20.6 to V3.4.8.0 failed with below error during replication/refresh. But if we reverted to older version(V2.20.6) on the same server it works

Unhandled Exception: System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
at System.Net.HttpWebRequest.GetRequestStream()
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at DBAmpNet2.sforce.SforceService.describeSObject(String sObjectType)
at DBAmpNet2.SFDataLayer3.GetSchema(String objName)
at DBAmpNet2.SFDataLayer3.GetColumnNamesAndRunQuery(String[]& theColNames, Boolean& bNoRowsInQuery)
at DBAmpNet2.Processor.Run()
at DBAmpNet2.Program.Main(String[] args)
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