Various actions fail in Plesk for Linux: Cannot connect to the task manager (plesk-task-manager service might not be running)

Symptoms

• Various actions fail in Plesk with the following error message:

  Cannot connect to the task manager (plesk-task-manager service might not be running): No such file or directory

• One of the following error messages appears in /var/log/plesk/task-manager.log:

  Cannot connect to systemd dbus: dial unix /var/run/dbus/system_bus_socket: connect: connection refused

  ---

  Failed to activate service 'org.freedesktop.systemd1': timed out

  ---

  Config yaml is missing, defaults are used: open /opt/psa/admin/conf/task-manager.yml: no such file or directory
  Detected systemd version is 237
  Cannot connect to systemd dbus: dial unix /var/run/dbus/system_bus_socket: connect: no such file or directory

Cause

The D-Bus service is not running properly.

Resolution

1. Connect to the Plesk server via SSH.

2. Restart the D-Bus service:

   # systemctl restart dbus.socket

3. Restart the Plesk Task Manager service:

   # service plesk-task-manager restart