Charles-François Natali added the comment:

> So this may have been a DNS related issue, perhaps a load balancer referring 
> the connection to a dead machine.  Yet, for some reason, the Windows command 
> line FTP client can recover from this problem after 20 seconds? What are they 
> doing right? Completely retrying the open?

Do you mean you're able to pass a timeout greater than 20 seconds to
the Windows command line FTP client?

In any case, there's nothing much we can do: if the TCP stack returns
the connection broken (timed out), we can't do much.
On Linux, you can increase the sysctls I mentioned in my previous
message, but that's it.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18907>
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