Panel doesn't seem to install correctly
When I install the server, I get this browser message. The installer does not error.
I have never seen that message before, but my guess is that you have another nginx config file that is conflicting with the pufferpanel.conf and is taking you to that page instead. Make sure pufferpanel.conf is the only file in /etc/nginx/sites-enabled (or /etc/nginx/conf.d on CentOS) and restart nginx.