Symptoms
Various tasks in Plesk are never executed, they are stuck as new at Tools & Settings > Task Manager page.
The following error can be found in /var/log/plesk/task-manager.log file:
ERROR 2022/09/04 Cannot fetch process properties: Cannot fetch 'run-plesk-task-93137.service' unit properties: dbus: connection closed by user
Cause
Stuck dbus.socket service.
Resolution
Connect to the server via SSH.
Restart dbus.socket and plesk-task-manager services:
#systemctl restart dbus.socket plesk-task-manager