def connectionLost(self, reason):
        """
        Inform the associated L{conncache.ConnectionCache} that this
        protocol has been disconnected.
        """
        self.nexus.conns.connectionLostForKey((endpoint.Q2QEndpoint(
                self.nexus.svc,
                self.nexus.addr,
                self.transport.getQ2QPeer(),
                PROTOCOL_NAME), None))
        AMP.connectionLost(self, reason)
Inform the associated L{conncache.ConnectionCache} that this
        protocol has been disconnected.