"socket operation on non socket" on Windows

[wiz1024 wiz1024]

Hi

I have a problem on Windows with the module urllib2 with python 2.5

when i use the "urlopen" function, i have some time the following error :
error<urlopen error (10038, 'Socket operation on non-socket')>

I don't understand why suddenly  this error arrives
The urlopen function is called from a thread


Thanks in advance.
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