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HowTo: Fix “unix:/var/run/php5-fpm.sock failed (13: Permission denied)”

If you look at the /usr/local/nginx/logs/error.log and see the following error, you can use the next steps to resolve the problem.

connect() to unix:/var/run/php5-fpm.sock failed (13: Permission denied) while connecting to upstream, client:

Change the owner of php5-fpm.sock and set permission to 660.

chown nginx:nginx /var/run/php5-fpm.sock
chmod 660 /var/run/php5-fpm.sock

Open the php5-fpm configuration file to edit the settings below:

nano /etc/php5/fpm/pool.d/www.conf

Use the same user/group  that the web server is running under. i.e. The nginx service is running under the user nginx while lighttpd is running under the user www-data.

listen.owner = nginx = nginx
listen.mode = 0660

Restart the PHP FPM service

sudo service php5-fpm restart

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