Symptoms
-
Fail2Ban error log full of the errors messages like:
fail2ban.filter [30094]: ERROR Failed to process line: u'', caught exception: IndexError('string index out of range',)
fail2ban.filter [30094]: ERROR Failed to process line: u'luQmdQYXl2VWZMCnFq', caught exception: IndexError('string index out of range',) -
Plesk panel jail is enabled
Cause
Product issue:
- #PPPM-13051 “Fai2ban no longer fails while processing the “plesk-panel” jail if debug mode is enabled in Plesk.”
Fixed in:- Plesk Obsidian 20 July 2021 (Linux)
Resolution
Please consider updating your server:
Workaround
If update is not possible for some reason, you may try the following
workaround
Disable Plesk debug mode or disable the only show.util_exec_io = on directive
