Last week i completed a format and reinstall of Ubuntu Server 16.04.01 LTS and Piwik is having some very strange problems.

When i run the archive cron, for all my sites i get the errors:

Error: Empty or invalid response '' for website id

Also, whenever i go to the plugins or marketplace pages the page just times out (this has happened even in my old setup).

Nginx error log shows:

2016/08/17 01:48:25 [error] 24156#24156: *95 upstream timed out (110: Connection timed out) while reading response header from upstream, client: x.x.x.x, server: xxxxxxxx.com, request: "GET /index.php?module=CorePluginsAdmin&action=plugins&idSite=1&period=day&date=yesterday&activated= HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.0-fpm-piwik.sock", host: "xxxxxxxx.com", referrer: "https://xxxxxxxx.com/index.php?module=CoreAdminHome&action=generalSettings&idSite=1&period=day&date=yesterday"

Any idea how to fix these things? I'm using Nginx and Php 7.0.9.