I had the same issue, for some reason nginx had a lot of duplicate config entries in `/etc/nginx/conf.d/locations.conf` and in `/etc/nginx/conf.d/servers.conf` which prevents nginx from starting. Looks like some kind of bug in the config generation in the upgrade process, which is unfortunate.
I've just fixed files manually via SSH, and it works fine.
Run `nginx -t` to test the config, then `/etc/rc.d/rc.nginx restart` to restart.