Fix Fail2Ban "Cannot add a custom filter to fail2ban"
There is a known issue in the fail2ban UI where filters don't show up if they are missing the "ignoreregex" property:
The form input on /admin/server-protection/add-filter should be validated either server-side and the user should be redirected to an error page, or the form could be checked client-side with JavaScript and show an error if there are no lines =~ "^[[:space:]]"ignoreregex" in the rule definition.
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Damon Dransfeld
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Thank you for reporting this bug, we have confirmed it (bug ID for your reference: PPPM-7718). Note: only feature requests are allowed here, so we would appreciate if you post bugs and issues on our forum at https://talk.plesk.com. We are closing this request since it does not contain any feature suggestions.
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IG