Connection Tracking Helper SFTP
A customer want to use a sftp Connection from extern to his Company. For this he install an QNAP NAS and activate SFTP over Port 2112 (SFTP Port 22 is not avaible).
The Problem is that when we want to connect extern the NAT and Firewall Rules is working, but SFTP Need more then the one port.
For FTP the solution and Routing works. But SFTP didnt work, For FTP you can use the Connection track helper, but SFTP can not use with that.
So please activate sftp to work with Connection track helper to work with the different ports.
That is an important feature! Competitors' products like SonicWall supporting sFTP throught their firewalls a couple of years!