Issue Fail2ban does not block IPs Couldn t load target

[cisco]

Here's my error.
Plesk Onyx 17.8.11 Update #49

fail2ban.action [10650]: ERROR iptables -w -n -L INPUT | grep -q 'f2b-apache[ \t]' -- stdout: ''
fail2ban.action [10650]: ERROR iptables -w -n -L INPUT | grep -q 'f2b-apache[ \t]' -- stderr: ''
fail2ban.action [10650]: ERROR iptables -w -n -L INPUT | grep -q 'f2b-apache[ \t]' -- returned 1
fail2ban.CommandAction [10650]: ERROR Invariant check failed. Trying to restore a sane environment
fail2ban.action [10650]: ERROR iptables -w -D INPUT -p tcp -m multiport --dports http,https,7080,7081 -j f2b-apache
iptables -w -F f2b-apache
iptables -w -X f2b-apache -- stdout: ''
iptables -w -X f2b-apache -- stderr: "iptables v1.6.0: Couldn't load target `f2b-apache':No such file or directory\n\nTry `iptables -h' or 'iptables --help' for more information.\niptables: No chain/target/match by that name.\niptables: No chain/target/match by that name.\n"
fail2ban.action [10650]: ERROR iptables -w -D INPUT -p tcp -m multiport --dports http,https,7080,7081 -j f2b-apache
iptables -w -F f2b-apache
iptables -w -X f2b-apache -- returned 1
fail2ban.actions [10650]: ERROR Failed to execute ban jail 'plesk-apache' action 'iptables-multiport' info 'CallingMap({'ipjailmatches': <function <lambda> at 0x7fb06bd8c9b0>, 'matches': u

 

[IgorG]

Look at this thread Fail2Ban Keeps Turning Off It may be useful for your case.

 

[cisco]

Look at this thread Fail2Ban Keeps Turning Off It may be useful for your case.

Yes, I reached this forum reading that thread. But looks like there is not a real solution...

 

[IgorG]

Anyway, I'd suggest you try to reinstall fail2ban first.