Any idea why this happens? Should I report it as a bug? After restarting Fail2ban resumes ok.
Running Fedora 28 fail2ban-0.10.3.1-2.fc28.noarch I see this error referenced on https://github.com/fail2ban/fail2ban/issues/1393 <https://github.com/fail2ban/fail2ban/issues/1393> and https://github.com/fail2ban/fail2ban/issues/1227 2018-10-08 06:22:44,922 fail2ban.actions [34352]: NOTICE [sshd] Ban 58.218.92.23 2018-10-08 06:22:44,933 fail2ban.utils [34352]: Level 39 7fc2040edc90 -- exec: iptables -n -L INPUT | grep -q 'f2b-sshd[ \t]' 2018-10-08 06:22:44,934 fail2ban.utils [34352]: ERROR 7fc2040edc90 -- returned 1 2018-10-08 06:22:44,934 fail2ban.CommandAction [34352]: ERROR Invariant check failed. Trying to restore a sane environment 2018-10-08 06:22:44,946 fail2ban.utils [34352]: Level 39 7fc2041a32b0 -- exec: iptables -D INPUT -p tcp -m multiport --dports ssh -j f2b-sshd iptables -F f2b-sshd iptables -X f2b-sshd 2018-10-08 06:22:44,946 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- stderr: "iptables v1.6.2: Couldn't load target `f2b-sshd':No such file or directory" 2018-10-08 06:22:44,947 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- stderr: '' 2018-10-08 06:22:44,947 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- stderr: "Try `iptables -h' or 'iptables --help' for more information." 2018-10-08 06:22:44,947 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- stderr: 'iptables: No chain/target/match by that name.' 2018-10-08 06:22:44,947 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- stderr: 'iptables: No chain/target/match by that name.' 2018-10-08 06:22:44,947 fail2ban.utils [34352]: ERROR 7fc2041a32b0 -- returned 1 2018-10-08 06:22:44,956 fail2ban.utils [34352]: Level 39 7fc2040edc90 -- exec: iptables -n -L INPUT | grep -q 'f2b-sshd[ \t]' 2018-10-08 06:22:44,957 fail2ban.utils [34352]: ERROR 7fc2040edc90 -- returned 1 2018-10-08 06:22:44,957 fail2ban.CommandAction [34352]: CRITICAL Unable to restore environment
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