Tells the server that a new client connected to the server listening port.
Use this method if remote TCP forwarding is used,
when new client has connected to the server listening port. If client agrees to create virtual
channel for TCP-data transferring from server the
is fired. If it doesn't agree,
Note: server must use this method only if remote forwarding was requested for the port which the connection was established with (OnServerForwardingRequest event was fired and Accept:=true was returned).