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PO'Port' object has no attribute 'socket'
 

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    <p>I'm using twisted python to make a simple SSH server on a custom port. I create a Port object with <code>port = reactor.listenTCP(_port, sshfactory)</code>, where _port is a variable that holds the integer of the port. I free up the port when shutting down the server with the commands <code>port.loseConnection()</code> and <code>port.connectionLost(reason=None)</code>. If I attempt to start the server, stop it, and start it again, I get the titular error 'Port' object has no attribute 'socket'</p> <p>Edit: full error message:</p> <pre><code>Unhandled error in Deferred: Traceback (most recent call last): File "C:\Python27\lib\site-packages\twisted\internet\base.py", line 1175, in mainLoop self.runUntilCurrent() File "C:\Python27\lib\site-packages\twisted\internet\base.py", line 779, in runUntilCurrent call.func(*call.args, **call.kw) File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 238, in callback self._startRunCallbacks(result) File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 307, in _startRunCallbacks self._runCallbacks() --- &lt;exception caught here&gt; --- File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 323, in _runCallbacks self.result = callback(self.result, *args, **kw) File "C:\Python27\lib\site-packages\twisted\internet\task.py", line 736, in &lt;lambda&gt; d.addCallback(lambda ignored: callable(*args, **kw)) File "C:\Python27\lib\site-packages\twisted\internet\tcp.py", line 981, in connectionLost self._closeSocket() File "C:\Python27\lib\site-packages\twisted\internet\tcp.py", line 92, in _closeSocket skt = self.socket exceptions.AttributeError: 'Port' object has no attribute 'socket' </code></pre> <p>Edit2: stopListening code sample (Python 2.7):</p> <p>stopListening sample.py</p> <pre><code>from twisted.cred import portal, checkers, credentials from twisted.conch import error, avatar, recvline, interfaces as conchinterfaces from twisted.conch.ssh import factory, userauth, connection, keys, session, common from twisted.conch.insults import insults from twisted.application import service, internet from twisted.internet import reactor, protocol from zope.interface import implements import threading import os class SSHDemoProtocol(recvline.HistoricRecvLine): def __init__(self, user): self.user = user def connectionMade(self): recvline.HistoricRecvLine.connectionMade(self) self.showPrompt() def showPrompt(self): self.terminal.write("$ ") class SSHDemoRealm: implements(portal.IRealm) def requestAvatar(self, avatarId, mind, *interfaces): if conchinterfaces.IConchUser in interfaces: return interfaces[0], SSHDemoAvatar(avatarId), lambda: None else: raise Exception("No supported interfaces found.") def getRSAKeys(): if not (os.path.exists('public.key') and os.path.exists('private.key')): # generate a RSA keypair print("Generating RSA keypair...") from Crypto.PublicKey import RSA KEY_LENGTH = 1024 rsaKey = RSA.generate(KEY_LENGTH, common.entropy.get_bytes) publicKeyString = keys.makePublicKeyString(rsaKey) privateKeyString = keys.makePrivateKeyString(rsaKey) # save keys for next time file('public.key', 'w+b').write(publicKeyString) file('private.key', 'w+b').write(privateKeyString) print("done.") else: publicKeyString = file('public.key').read() privateKeyString = file('private.key').read() return publicKeyString, privateKeyString def launchServer(): _port = 4564 password = 'password' sshFactory = factory.SSHFactory() sshFactory.portal = portal.Portal(SSHDemoRealm()) users = {'user': password} sshFactory.portal.registerChecker( checkers.InMemoryUsernamePasswordDatabaseDontUse(**users)) pubKeyString, privKeyString = getRSAKeys() sshFactory.publicKeys = { 'ssh-rsa': keys.getPublicKeyString(data=pubKeyString)} sshFactory.privateKeys = { 'ssh-rsa': keys.getPrivateKeyObject(data=privKeyString)} global port port = reactor.listenTCP(_port, sshFactory) reactor.addSystemEventTrigger('before', 'shutdown', stopServer) reactor.run(installSignalHandlers=False) def startServer(): thread = threading.Thread(target=launchServer) thread.start() def stopServer(): global port port.stopListening() reactor.stop() reactor.crash() startServer() stopServer() startServer() </code></pre> <p>traceback:</p> <pre><code>&gt;&gt;&gt; Exception in thread Thread-2: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner self.run() File "/usr/lib/python2.7/threading.py", line 505, in run self.__target(*self.__args, **self.__kwargs) File "/home/paul/Desktop/Down2Home/stopListening sample.py", line 62, in launchServer port = reactor.listenTCP(_port, sshFactory) File "/usr/local/lib/python2.7/dist-packages/Twisted-9.0.0-py2.7-linux-x86_64.egg/twisted/internet/posixbase.py", line 355, in listenTCP p.startListening() File "/usr/local/lib/python2.7/dist-packages/Twisted-9.0.0-py2.7-linux-x86_64.egg/twisted/internet/tcp.py", line 855, in startListening raise CannotListenError, (self.interface, self.port, le) CannotListenError: Couldn't listen on any:4564: [Errno 98] Address already in use. </code></pre>
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    1. COPerhaps I should note that I am using Twisted 9.0 because that's what I had to do to make it compatible with an older code example I was working from.
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