No actual rules are present in
iptables after server reboot on CentOS 7.2 and Ubuntu 12.04.
All rules were configured using
Plesk Firewall extension.
fail2ban is also installed and enabled for auto start.
It is possible to find these errors in system journal:
psa-firewall: Another app is currently holding the xtables lock. Perhaps you want to use the -w option? psa-firewall: psa-firewall: failed to apply firewall configuration
fail2ban was not completely loaded when
psa-firewall started applying
Only one app can add rules to
iptables at one time.
Bug PPPM-3993. It is fixed in Plesk 12 MU #81, Plesk 12.5 MU #26 and Plesk Onyx .
Install the latest microupdates or upgrade to the latest Plesk version.