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That error message implies that PHP-FPM is not running. The first step in debugging this would be to check on the processes status by running:
- sudo service php5-fpm status
You can restart the process using:
- sudo service php5-fpm restart
If the process has crashed for some reason, check the error log for any messages that can point towards the case.
- less /var/log/php5-fpm.log