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Plesk shows 502 Bad Gateway error and service sw-engine is marked as stopped

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Plesk for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

  • Plesk shows 502 Bad Gateway error

  • The service sw-engine is not running:

    # service sw-engine status
    ● sw-engine.service - Startup script for Panel sw-engine
    Loaded: loaded (/usr/lib/systemd/system/sw-engine.service; enabled; vendor preset: disabled)
    Active: inactive (dead) since Mon 2018-03-26 21:57:49 +07; 5min ago

    # systemctl status sw-engine -l
    ● sw-engine.service - Startup script for Panel sw-engine
    Loaded: loaded (/usr/lib/systemd/system/sw-engine.service; enabled; vendor preset: disabled)
    Active: activating (auto-restart) (Result: exit-code) since ma 2022-07-11 11:31:10 -3; 2s ago

Cause

sw-engine service is stopped. This may occur if the server has no free disk space, an upgrade attempt was unsuccessful or the service was stopped manually.

Resolution

  1. Free up disk space on the server

  2. Restart Plesk sw-engine service

    Using Plesk Repair Kit
    1. Click Open Repair Kit and log in with Plesk admin credentials.
      Repair Kit
    2. If it was successful, try starting sw-engine service by clicking Restart Processes
      Repair Kit
    3. If it was successfully started, click Log In to Plesk button
      Repair Kit
    Using SSH

    1. Connect to the server via SSH

    2. Start sw-engine service:

      # service sw-engine start

      Or start psa service:

      # service psa start

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