PF Fail2ban and ftp-proxy. How to block client ip?

[Kenzo68]

I need to have an FTP server and for security I installed it in a dedicated jail. To route traffic I use ftp-proxy.
To try to avoid unwanted access to the system I use fail2ban which detects intrusion attempts but obviously blocks the proxy address on the Lan side.
How can I transfer the client's IP address and ban it and not the proxy's?
Thanks in advance.

 

[Kenzo68]

Up
Thanks!

 

[covacat]

if the ftp-proxy logs failed logins you can make that log available to fail2ban

 

[Kenzo68]

It doesn't.
The proxy forwards the traffic and applies FTP rules.
The FTP server denies access, but the address is the proxy's LAN side.