fail2ban for gopher
Wed, 29 Oct 2025 12:24:43 +0100
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Searching I found that  a  fail2ban  gophernicus  filter  has  been 
proposed,  but isn't included in  Deban 13 (Trixie),  however  it's 
easy to implement and adds a bit of extra security:

in /etc/jail.conf add

 [gophernicus]
 enabled = true
 port = 70
 logpath = /var/log/gophernicus/access.log
 filter = gophernicus

create /etc/filter.d/gophernicus with:

 [INCLUDES]
 before = common.conf
 [Definition]
 _daemon = gophernicus
 failregex = ^%(__prefix_line)serror ".*" for request ".*" from <HOST> (.*)$
 ignoreregex =

fail2ban gopher commit:
https://github.com/fail2ban/fail2ban/pull/3240/commits/5d44bfa15b9aad05af30b51cd7a164198b6f67cf



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