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Websites on PHP-FPM shows 502 Bad Gateway or 504 Gateway Timeout: Reloading in progress

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Ekaterina Babenko
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Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Websites or site's preview that use php-fpm show following errors: 502 Bad Gateway or 504 Gateway Timeout;
  • In /var/log/php-fpm/error.log or similar, the following record can be found:

    CONFIG_TEXT: NOTICE: Reloading in progress ...

    OR

    CONFIG_TEXT: AH01079: failed to make connection to backend: httpd-UDS / AH02454: FCGI: attempt to connect to Unix domain socket failed

  • Website is using system PHP-FPM.

Cause

php-fpm service is hanged or down.

Resolution

It is required to restart the service in case it hung. It is possible to do that via Plesk interface and via SSH.

Using Plesk interface

In Plesk interface, navigate to Tools & Settings > Services Management and restart the required PHP-FPM handler (the one that is assigned to the corresponding site):
Click Install

Using SSH connection.
  1. Connect to the server via SSH;
  2. Restart PHP-FPM service:

    # service php-fpm restart

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