fail2ban 500 Error

[mytoby]

Username:

TITLE

fail2ban 500 Error

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE

ubuntu 24.04

PROBLEM DESCRIPTION

On Site Jails > Add

STEPS TO REPRODUCE

On Site Jails > Add

ACTUAL RESULT

Message

f2bmng failed: ERROR:__main__:Failed to get packages by files: package manager returned 2 lines instead of expected 0. Command was ['/usr/bin/dpkg', '-S'] and returned exit status 2. Your package system might be inconsistent. Please check it for issues with 'plesk sbin pum --check --full'.

EXPECTED RESULT

Reinstall brings no possible result

ANY ADDITIONAL INFORMATION

(DID NOT ANSWER QUESTION)

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM

Confirm bug

 

[Sebahat.hadzhi]

Hello, @mytoby . Thank you for the report. I attempted to reproduce the issue on a Ubuntu 24.04-based server with the latest Plesk version 16.0.69, however, I am able to add a test jail without an issue. The error you are encountering suggests that there is most likely an issue with the Fail2ban service/packages. Please try the workaround from this article:

Unable to create a subscription or open Jails in Fail2Ban: f2bmng failed: ERROR:f2bmng - Support Cases from Plesk Knowledge Base

Unable to create a subscription or open Jails in Fail2Ban: f2bmng failed: ERROR:f2bmng - Support Cases - Plesk Knowledge Base

www.plesk.com

 

[mytoby]

Thanks this workaround i have do it before with the same result.
In the Log is:
2025-04-21 22:36:49,869 fail2ban.transmitter [105125]: ERROR Jail 'ssh' skipped, because of wrong configuration: Unable to read the filter 'sshd'
2025-04-21 22:36:49,869 fail2ban.transmitter [105125]: ERROR Jail 'recidive' skipped, because of wrong configuration: Unable to read the filter 'recidive'

and i become the same error 500 after the reinstall.

if i want to edit a exists jail, it is the same error.