I have been trying to setup a new VPS (Ubuntu) with nginx and php7 to host 3 wordpress sites (3 domains). It works mostly, except trying to access the back-end.
When I go to /wp-admin/ I get the login form, but after logging in, the page either just turns blank (with a 500 header) or it shows a 500 error page.
I've been trying to get it to work for 3 days now, so I fear I am getting blind-sighted. I would be grateful if anyone could check my config-files.
I posted them on http://pastebin.com/FrUanYVY
There are 5 files: nginx.conf, default, domain1.com, common.conf and wordpress.conf; I obfuscated all IPs and domain names.
Thanks in advance.

PS: nginx version 1.4.6



Edited 1 time(s). Last edit at 03/27/2016 07:09AM by EvertVd.

PPS: I decided to upgrade (sudo add-apt-repository ppa:nginx/stable) so now it is version 1.8.1. The problem persists, so any help would be soooo appreciated!