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#1 2018-08-01 06:31:54

kde35
Member
Registered: 2017-12-18
Posts: 23

fail2ban Retrieving own hostnames failed: unknown encoding: idna [Solv

Hi, since yesterday evning when I performed

 pacman -Syu

, I start getting the warning

2018-07-31 20:14:18,782 fail2ban.ipdns          [327]: WARNING Retrieving own hostnames failed: unknown encoding: idna
2018-07-31 20:14:18,803 fail2ban.ipdns          [327]: WARNING Unable to find a corresponding IP address for XXX: unknown 
encoding: idna
2018-07-31 20:14:18,803 fail2ban.ipdns          [327]: WARNING Unable to find a corresponding IP address for localhost: un
known encoding: idna

in my fail2ban log (I replaced the hostname with XXX in the above).

My questions are :

  • Is this serious?

  • Which package I upgraded yesterday is causing this? I upgraded about 100 packages yesterday between 20:11 and 20:15.

  • How do I get rid of these warnings/their possible consequences?

For information, I only have ssh jail running at the moment (but I have intention of adding more jails as I am running other servers), and
I don't ssh from this machine to itself...

Last edited by kde35 (2018-08-06 06:47:52)

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#2 2018-08-01 10:30:09

kde35
Member
Registered: 2017-12-18
Posts: 23

Re: fail2ban Retrieving own hostnames failed: unknown encoding: idna [Solv

  • Which package I upgraded yesterday is causing this? I upgraded about 100 packages yesterday between 20:11 and 20:15.

I think I figured out the answer to this one, in view of the dependencies of fail2ban, it must be python. 

[2018-07-31 20:14] [ALPM] upgraded python (3.6.5-3.0 -> 3.6.6-1.0)

.  But this still doesn't solve the issue.

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#3 2018-08-06 06:47:30

kde35
Member
Registered: 2017-12-18
Posts: 23

Re: fail2ban Retrieving own hostnames failed: unknown encoding: idna [Solv

Somehow this problem disappeared.  I don't know why.

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