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 127.0.0.1:56789

Hello ,
I am facing an issue with my socket connection. I have a web Service in Project and It connect to a service installed in the same server. The Service is getting crashed and it has successfully restarted by another monitoring application in our project. But when the web method tries to access the method in the service I am getting a web exception. But when we restart the service manually it works fine. Here is web exception I am getting and Code used.
Code used
string url = "http://localhost:56789/" + SERVICE_NAME; m_target = Activator.GetObject(typeof(IWebServiceInterface), url ...