Fail2ban 0.11.2 – nxd jail – IndexError(‘string index out of range’,)

[Eeel]

Fail2ban 0.11.2 has a known bug that can be fixed by correcting the nxd.conf filter provided with NoMachine. This fix is from the Fail2ban maintainer.

Fail2ban error:

IndexError('string index out of range',)

nxd.conf:

#
# Fail2Ban filter for NoMachine.
#

[Definition]

#
# Regex matches all accepted NX protocol connections.
#

datepattern = \son (?:%%a )?%%b %%d %%k:%%M:%%S(?:\.%%f)?(?: %%Y)?\.$
failregex = ^Info: Connection from <ADDR>

ignoreregex =

Link to NoMachine Fail2ban article

 

[Britgirl]

Hi, thanks for this. We are now verifying. Do you happen to have a link to the known Fail2ban bug? That way we can link to it.

[Eeel]

Sure, this is the post i open on fail2ban Github, Sebres linked the issue in his answer:

https://github.com/fail2ban/fail2ban/discussions/3188

Best,

[Britgirl]

Thank you for that! We checked and can confirm the fix you provided works when for that version of Fail2ban 0.11.2. We will be updating our article about Fail2ban soon (https://www.nomachine.com/AR05P00983).

[Author]

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