Hi Chris, On March 22, 2016 at 2:42:14 PM, Chris Norman (chris.norman2@googlemail.com) wrote: Hi all, I'm sure I asked this question before, but I can't find any answers on google, and I've changed my work flow a bit now, so thought it was worth re-asking. So on my server's protocol, I have a send method. This allows me to pass arguments which get sent off to the client in the right format. The send method looks something like this: def send(self, command, **kwargs): """Cause the client to issue getattr(connection, command)(**kwargs). If disconnect evaluates to True, disconnect the client after the message is sent.""" disconnect = kwargs.get('disconnect', False) try: del kwargs['disconnect'] except KeyError: pass # Argument not found. d = defer.Deferred() d.addCallback(self.prepare_command) Convert the command and kwargs to json. d.addCallback(self.deferred_write) # Write the json to the transport. if disconnect: d.addCallback(self.deferred_disconnect) # Issue self.transport.loseConnection(). You are disconnecting right here, without waiting for your Deferred to fire. It might make better sense to add the call the self.transport.loseConnection() to your Deferred’s callback chain. Hope this helps, Daniel -- L. Daniel Burr ldanielburr@me.com (312) 656-8387