paramiko.SSHException : No existing session ???

[sa6113]

I use this code :

hostname = "192.168.1.4"
username = "test"
port = 22
password = '123456'

# now connect
try:
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect_ex((hostname, port))
except Exception, e:
    print 'Connect failed: ' + str(e)
    traceback.print_exc()
    sys.exit(1)

t = paramiko.Transport(sock)
event = threading.Event()
t.start_client(event)
print "started client"
event.wait(15)

if not t.is_active():
    print 'SSH negotiation failed.'
    sys.exit(1)
else:
    print "SSH negotiation sucessful"

print "doing authentication"
t.auth_password(username, password, event)


event.clear()
event.wait(20)

----------------- 
the result is :
started client
ssh negotiation sucessful
donig authentication
....
paramiko.SSHException : No existing session

-------------------
I am sure that the username and password exists properly.
what is the problem??


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