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June 2005, Week 4

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Subject:
Re: FTP 'Unkonwn Socket Error'
From:
Jeff Kell <[log in to unmask]>
Reply To:
Jeff Kell <[log in to unmask]>
Date:
Thu, 23 Jun 2005 22:21:19 -0400
Content-Type:
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James Hofmeister wrote:

> RE: FTP 'Unkonwn Socket Error'
>
> "UnKnown Socket Error" is typically seen when the remote host unexpectedly
> slams shut the FTP data connection previous to sending a positive (200
> range) or negative (400-500) range reply on the FTP command connection.

Hmmm... is it possible the other end fails to open the PORT specification?  If it is the same server that the others are working fine, it probably isn't the server itself, but...

Are you running behind network address translation (on the problem client end)?  Is the device doing the translation capable of doing FTP protocol fixups?  If not, you may be passing an internal address up the pipe in the PORT command which remains untranslated, and meaningless to the other end.  That will trash active mode transfers, and if your NAT is done in overload (port translation) it can screw up PASV too.

Jeff

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