Fail2ban and Nginx Proxy Manager (Docker)

[Phidefer]

Hi use NPM (docker) and it works well. I have installed fail2ban with docker too but I have a problem. The path to the log files is good but fail2ban try to ban a ip address I have this message :

[npm-docker] Ban 195.242.242.30

2025-02-04 16:26:29,549 fail2ban.utils [1]: ERROR 7fdd32a05930 -- exec: { iptables-nft -w -C f2b-npm-docker -j RETURN >/dev/null 2>&1; } || { iptables-nft -w -N f2b-npm-docker || true; iptables-nft -w -A f2b-npm-docker -j RETURN; }

for proto in $(echo 'tcp' | sed 's/,/ /g'); do

{ iptables-nft -w -C DOCKER-USER -p $proto -j f2b-npm-docker >/dev/null 2>&1; } || { iptables-nft -w -I DOCKER-USER -p $proto -j f2b-npm-docker; }

done

2025-02-04 16:26:29,549 fail2ban.utils [1]: ERROR 7fdd32a05930 -- stderr: 'iptables: No chain/target/match by that name.'

2025-02-04 16:26:29,549 fail2ban.utils [1]: ERROR 7fdd32a05930 -- returned 1

2025-02-04 16:26:29,549 fail2ban.actions [1]: ERROR Failed to execute ban jail 'npm-docker' action 'iptables-nft' info 'ActionInfo({'ip': '195.242.242.30', 'family': 'inet4', 'fid': <function Actions.ActionInfo. at 0x7fdd329d5bc0>, 'raw-ticket': <function Actions.ActionInfo. at 0x7fdd329d6340>})': Error starting action Jail('npm-docker')/iptables-nft: 'Script error'

so the ip is still able to access my server and is not banned. How can I solve this issue ?
Thx