Upgrade to Ubuntu16.04 LTS from 14.04 LTS killed my php

[purvez]

I had a fully functioning ubuntu 14.04 serving up via nginx a passenger/ror
site with 'some' php.

The passenger/ror bit works fine after the upgrade however any attempt at
accessing my php files gives a 404 Not Found error:

The error.log for nginx shows the following:

=================================

2017/04/22 11:16:22 [crit] 16531#0: *1 connect() to
unix:/var/run/php/php7.0-fpm.sock failed (13: Permission denied) while
connecting to upstream, client: 212.159.100.115, server:
resys.gourmindia.com, request: "GET /phpinfo.php HTTP/1.1", upstream:
"fastcgi://unix:/var/run/php/php7.0-fpm.sock:", host:
"resys.gourmindia.com"

==================

My question is what should the /var/run/php/php7.0-fpm.sock have as
permission?

ALL help gratefully received with thanks.

Purvez

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,273798,273798#msg-273798