Re: [Fail2ban-users] Unable to find corresponding IP address for ::1

[Alex <mys...@gm...>]

Hi,

> Fail2ban has no support for detecting ipv6 addresses. However it has
> support for detecting hostnames, and banning ip addresses after doing a
> ip lookup on the hostname.
>
> One of your patterns detected a host named '::1'. It is not an ipv4
> address, so it must be a hostname. The error indicates that the ip
> lookup for the hostname '::1' failed (naturally).

It looks like it's this entry from syslog:

Mar 31 03:18:22 email1 dovecot: imap-login: Login: user=<user1>,
method=PLAIN, rip=::1, lip=::1, mpid=23893, secured,
session=<yAk0TzPZeQAAAAAAAAAAAAAAAAAAAAAB>

This looks like a webmail (squirrelmail) login with dovecot. I don't
really need IPv6 support. Should I somehow just get dovecot to listen
on IPv4 addresses only?

Does this affect its normal operation, other than not being able to
capture these addresses? In other words, if I didn't need it to match
on this particular line, is it a problem? Can I disable the warnings
in the interim?

Thanks,
Alex