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Unable to start Apache web server on a Plesk server: AH02093: mod_watchdog is required

Kuzma Ivanov
Updated
Plesk for Linux kb: technical Ideal

Applicable to:

  • Plesk for Linux

Symptoms

  • Websites fail to load with one of the following error messages in a web browser:

    PLESK_INFO: 502 Bad Gateway

    PLESK_INFO: ERR_CONNECTION_REFUSED

  • Apache service fails to start or is in reloading status.

  • The following error messages are logged in /var/log/httpd/error_log:

    CONFIG_TEXT: AH03262: mod_watchdog is required
    AH00020: Configuration Failed, exiting

Cause

Module mod_watchdog required by Apache is disabled on the server.

Resolution

Plesk interface
  1. Log in to Plesk.
  2. Go to Tools & Settings > Apache & nginx Settings.
  3. In Apache modules section, turn on watchdog module.
  4. Apply the changes.
Command-line interface
  1. Connect to your Plesk server via SSH.

  2. Open the file /etc/httpd/conf.modules.d/00-base.conf in a text editor. In this example, we are using vi editor:

    # vi /etc/httpd/conf.modules.d/00-base.conf

  3. Find the line with watchdog_module and uncomment it:
    Before:

    CONFIG_TEXT: ;LoadModule watchdog_module modules/mod_watchdog.so

    After:

    CONFIG_TEXT: LoadModule watchdog_module modules/mod_watchdog.so

  4. Save the changes and close the file.

  5. Restart the Apache service:

    # service httpd restart

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