docs: def connectionJustEstablished(self):
          """
          We sent out SYN, they acknowledged it.  Congratulations, you
          have a new baby connection.
          """
          assert not self.disconnecting
          assert not self.disconnected
          try:
              p = self.factory.buildProtocol(PTCPAddress(
                      self.peerAddressTuple, self.pseudoPortPair))
              p.makeConnection(self)
          except:
              log.msg("Exception during PTCP connection setup.")
              log.err()
              self.loseConnection()
          else:
              self.protocol = p