For example, there is not a single call to self.d.errback -- there should probably be at least two, one if the connection is lost, and one if the server sends an error. However, this is the least of dict's problems -- the whole interface looks backwards, as it should probably be nicely wrapped up in a factory, so it can also errback on connection failed. I would request some more initial quality control on new protocol implementations. Thanks, Moshe Zadka