nginx error connect to php5-fpm.sock failed (13: Permission denied)

I had a similar error after php update. PHP fixed a security bug where o had rw permission to the socket file.

  1. Open /etc/php5/fpm/pool.d/www.conf or /etc/php/7.0/fpm/pool.d/www.conf, depending on your version.
  2. Uncomment all permission lines, like:

    listen.owner = www-data
    listen.group = www-data
    listen.mode = 0660
    
  3. Restart fpm – sudo service php5-fpm restart or sudo service php7.0-fpm restart

Note: if your webserver runs as user other than www-data, you will need to update the www.conf file accordingly

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