John Nagle added the comment:

The server operator at the US Securities and Exchange Commission writes to me: 
"There was a DNS issue that affected the availability of FTP at night. We 
believe it is resolved. Please let us know if you encounter any further 
problems.  Thanks, SEC Webmaster".

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?

----------
status: pending -> open

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