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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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Plesk Onyx for Linux Plesk Obsidian kb: technical ABT: Group B

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Websites or site's preview show one of the following errors in browser:

    CONFIG_TEXT: 502 Bad Gateway

    CONFIG_TEXT: 504 Gateway Timeout

  • In /var/log/php-fpm/error.log or similar, the following record can be found:

    CONFIG_TEXT: Reloading in progress ...

  • Website is using PHP handler by OS vendor as PHP-FPM application in Plesk > domains > example.com> PHP Settings:
    Capture.PNG

Cause

php-fpm service is hanged or down.

Resolution

via Plesk interface
  1. Login into Plesk;
  2. Restart hanged service in Tools & Settings > Services Management: 
    Capture_2.PNG
via SSH
  1. Connect to the server via SSH;
  2. Restart PHP-FPM service:

    # service php-fpm restart

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