haproxy and secure ftp server.

how to use Haproxy to publish an internal SFTP server.
Jasmin shahrzadAsked:
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nociSoftware EngineerCommented:
It might work by using a TCP Frontend/Backend listening on port 22 and connecting to port 22.

then again why not forward port 22  to  the intended target.
There is nothing in a SSH session that is useful to haproxy for dispatching, the link is encrypted from the start,
no SNI... (SSL isn't used).
It will surely give a better performance .
Jasmin shahrzadAuthor Commented:
What does you mean. can you please detail your suggestion for forward port 22 to the intended target.

i have a a ubuntu (u1)server with ssh on port 107000 there is not login for user ftpuser
then on other ubuntu (u2)box i have haproxy with haproxy.cfg like that


listen  ftp-server
        bind    :4141
        mode    tcp
        default_backend sftp-server

backend sftp-server
        server ftp01 u1.mydomain.com:107000 check

what i do wrong here
from filezila
i try sftp://u2.mydomain.com username password port=4141
nociSoftware EngineerCommented:
okee....., SFTP != FTPS ....
SFTP is ftp / cp  over SSH link (scp of sftp from command prompt....)
FTPS = FTP + SSL ... and that is a problem.  

FTP uses a different protocol that uses multiple ports.
in (control) port 21 + (data) port 20 for transport. (although you can change the control port )

The backend needs to connect to the SSH port on a system (you may want to use scponly to prevent ssh shell access).
then you can use scp -oPort=4141  .... or sftp -o Port=4141 ...

port 107000 is not possible as well max value = 65535
and i expect that you need to use 22 there.

more like:
listen  sftp-server
        bind    :4141
        mode    tcp
        default_backend sftp-server

backend sftp-server
         mode tcp
        server sftp01 u1.mydomain.com:22 check

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