Certificate problems

I’m running a standalone chef server version 12.15.19 on ubuntu 16. When I attempt to apply an InCommon cert, it holds on to the self-signed certificate I was originally using. I have edited the chef-server.rb file and added 2 lines to reference my certificate. Once i run the reconfigure command and restart nginx, the server is no longer listening on 443. Any suggestions on what to try? I’m running out of ideas