diff --git a/lib/os/class.ISPConfigDebianOS.inc.php b/lib/os/class.ISPConfigDebianOS.inc.php
index fb7891d7330ed67be78c9cc4be6d954df7513da4..d35f371c346367de7de2bd9ac3dda2ca0d43959e 100644
--- a/lib/os/class.ISPConfigDebianOS.inc.php
+++ b/lib/os/class.ISPConfigDebianOS.inc.php
@@ -2021,6 +2021,10 @@ SCRIPTWHITELIST=/usr/bin/lwp-request';
 		unset($jk_jail);
 
 		$this->restartService('fail2ban');
+		
+		// Fail2Ban is disabled by default on Ubuntu 22.04 and newer. Enabling it on any OS does not hurt.
+		$cmd = 'systemctl enable fail2ban >/dev/null 2>&1';
+		$this->exec($cmd); // ignore if this fails
 
 		$this->fixDbconfigCommon();