Hello! I am working through the Twisted Network Programming Essentials book by Abe Fettig, using python24 and twisted 2.1 on a Win2k sp4 Server platform. Python crashes with a memory reference error on 'reactor.run()' when I run this code (connectiontest.py from Chap 2): Any suggestions greatly appreciated!!! **** from twisted.internet import reactor, defer, protocol class CallbackAndDisconnectProtocol(protocol.Protocol): def connectionMade(self): self.factory.deferred.callback("Connected!") self.transport.loseConnection() class ConnectionTestFactory(protocol.ClientFactory): protocol = CallbackAndDisconnectProtocol def __init__(self): self.deferred = defer.Deferred() def clientConnectionFailed(self, connector, reason): self.deferred.errback(reason) def testConnect(host, port): testFactory = ConnectionTestFactory() reactor.connectTCP(host, port, testFactory) return testFactory.deferred def handleSuccess(result, port): print "Connected to port %i" % port reactor.stop() def handleFailure(failure, port): print "Error connecting to port %i: %s" % ( port, failure.getErrorMessage()) reactor.stop() if __name__ == "__main__": import sys #if not len(sys.argv) == 3: # print "Usage: connectiontest.py host port" # sys.exit(1) host = 'localhost' port = 82 connecting = testConnect(host, port) connecting.addCallback(handleSuccess, port) connecting.addErrback(handleFailure, port) reactor.run()