Hi, I have a server which can handle multiple connections. At any given time, I want to send out a ping to see who is still listening to this server. For this I scan through my list of ip's and send out a msg with factory = ClientFactory() factory.protocol = caller factory.message = self.message factory.alive = 0 reactor.connectTCP(self.ip, self.port, factory) and wait on the response. This is done from within an application daemon, so no reactor.run() is required. How can I send a message out and wait for the response before proceeding? I tried using deferreds a bunch of different ways but I can't seem to get it going. Oh and I should clarify I want the response to be in the original stream, not in the thread created by connectTCP/dataReceived/etc... thanks, Nima