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In my access.log I got somerow a

ip - - [date] method link ... etc..

and some others with

www.domain.com:ip - - [date] method link ... etc..

I am actually using this regexp

 ^<HOST>.*/phpmyadmin

The problem is that It causes that fail2ban uses as ip the reverse lookup of www.domain.com when parsing the second kind of rows.

Is there a more precise regexp for ip and not host name?

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I think you want to tell fail2ban to not do hostname lookups.

use_dns
yes   (current behavior)
warn  (uses but warns upon each dns lookup)
no    (no DNS lookup, no warnings, INFO-LEVEL log messages when
       rDNS was necessary and entry was ignored because of that)

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