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Make sure that PHP-FPM is running. If you’ve installed that version, then this should start it:
systemctl start php7.0-fpm
This should also return something to show that it is installed:
find /etc/systemd -name "*fpm*"
If that returns another version, like say php7.2-fpm, then you need to adjust the start command above, as well as your Nginx config to reference php7.2-fpm.sock.
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