Tells the server to notify the SSH client, that new connection was established to the server's listening port.
Use this method if remote TCP forwarding is used,
when new client has connected to the server's listening port. If the SSH client agrees to create virtual
channel for TCP-data transfer from the server, the
is fired. If SSH client declines forwarding request,
Note: the server must use this method only if remote forwarding was requested for the port with which the connection was established (OnServerForwardingRequest event was fired and Accept:=true was returned).