[Twisted-Python] A non-blocking socket operation could not be completed immediately

[Tommaso Mazzafico]

I tried this code:

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from twisted.spread import pb
from twisted.internet import reactor

class Echoer(pb.Root):
   def remote_echo(self, s):
      return s
if __name__ == "__main__":
   reactor.listenTCP(8001, pb.PBServerFactory(Echoer()))
   reactor.run()
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On Windows XP all is ok.
On Windows 7 64 I receive this error message:

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C:\Program Files (x86)\Python\lib\site-packages\twisted\spread\pb.py:30: DeprecationWarning: the md5 module is deprecated; use hashlib instead
  import md5
Traceback (most recent call last):
  File "C:\Users\bob\Documents\Twisted\pbs.py", line 11, in <module>
    reactor.listenTCP(8001, pb.PBServerFactory(Echoer()))
  File "C:\Program Files (x86)\Python\lib\site-packages\twisted\internet\posixbase.py", line 356, in listenTCP
    p.startListening()
  File "C:\Program Files (x86)\Python\lib\site-packages\twisted\internet\tcp.py", line 862, in startListening
    self._realPortNumber = skt.getsockname()[1]
  File "<string>", line 1, in getsockname
socket.error: [Errno 10035] A non-blocking socket operation could not be completed immediately
-----------------------------------------

What can I do?