Dominic has correctly identified the issue. In Ubuntu 16.04, if you stop
fail2ban using fail2ban-client rather than systemctl, then systemd will
think that fail2ban died abnormally, complain in the logs about that,
and attempt to restart it. Use systemctl to stop it cleanly.
jik
On 8/7/17 4:01 PM, Dominic Raferd wrote:
> On 7 August 2017 at 20:33, Michael Fox <n...@mefox.org
> <mailto:n...@mefox.org>> wrote:
>
> I've been a user of fail2ban for several years. I'm not an
> expert. But I'm
> not a newbie either. Everything has been running fine on Ubuntu
> 14.04.
>
> I'm building a new Ubuntu 16.04 machine. I installed the fail2ban
> package
> (v0.9.3) and encountered this problem immediately after install
> and before
> performing any customization at all.
>
> "fail2ban-client stop" claims success, but syslog shows problems.
>
> Question 1: Why is the client reporting success even though there is
> evidently a problem?
> Question 2: Why is it starting again, when the command given was
> "stop"?
>
> $ sudo fail2ban-client stop
> Shutdown successful
>
>
>
> Not sure if it will help, but in Ubuntu 16.04 the way to start and
> stop fail2ban is with systemctl (under systemd control):
>
> sudo systemctl start|stop|reload-or-restart fail2ban
>
> BTW, fail2ban 0.9.3 can be very (very) slow starting, stopping and
> reloading.
>
>
>
>
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