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From "Steffen Heil" <li...@steffen-heil.de>
Subject RE: [net-ftp] FTPS timeout when trying to upload a file
Date Thu, 08 Feb 2007 08:41:41 GMT
Hi

Warning: Wild guessing ahead:

> When my FTP client ...

So you have the client on your side.

> But, admin.quiksilver.com is 66.161.40.76, not 172.20.10.50.

Note, this IP is a private address, which is not even suppost to be routed.

> ... FTPSClient ... 

And that is using ftpS.


So I guess the Server itself actually HAS 172.20.10.50 and is behind some
NAT router, which inspects protocolls to replace the internal ip
172.20.10.50 with the external one 66.161.40.76. I also suppose, this works
fine for FTP and external systems never see the internal address.

However, FTPS is SSL-encrypted and as such the NAT-router cannot change or
even see, what's inside the packet. So you get the original reply.


There is nothing you can do about that, except if you can reconfigure the
server.

SFTP doesn't play well behind nat routers, if not configured especially. For
example pure-ftps has an option to specify another ip address for answers as
that one and to ignore the servers ip address. The only other option would
be to enable the nat router to decrypt the ssl connection, which would be
both very cpu-consuming and insecure.

Regards,
  Steffen

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