Website running on PHP-FPM shows 503 Service Temporarily Unavailable: AH00959: ap_proxy_connect_backend disabling worker for (127.0.0.1)

Created:

2016-11-16 13:22:50 UTC

Modified:

2017-08-16 15:50:56 UTC

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Website running on PHP-FPM shows 503 Service Temporarily Unavailable: AH00959: ap_proxy_connect_backend disabling worker for (127.0.0.1)

Applicable to:

  • Plesk 12.5 for Linux
  • Plesk Onyx for Linux

Symptoms

  • Website is showing the following error:

    503 Service Temporarily Unavailable

    At the same time the following errors can be found in /var/log/plesk/panel.log :

    [Sat Oct 17 11:50:20.153149 2015] [proxy:error] [pid 12966] AH00959: ap_proxy_connect_backend disabling worker for (127.0.0.1) for 60s
    [Sat Oct 17 11:50:20.153161 2015] [proxy_fcgi:error] [pid 12966] [client 10.10.10.10:53377] AH01079: failed to make connection to backend: 127.0.0.1, referer: https://example.com/
  • Website is using PHP-FPM handler.

Cause

PHP-FPM service is stopped.

Resolution

  1. Check what version of PHP is used by domain in Domains > example.com > PHP Settings .

  2. Start it, for example for PHP 5.6:

    # service plesk-php56-fpm start
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