@humanmadeaccount @lullerhaus . Sorry me English is bad..
I've some problem to. I use mongodb v.3.2.1

But I remove or comment back my mongo conf
#security:
#authorization: enabled

sudo service mongod restart

and boom.. i can see my database status at control panel.

I use this setup for fist install nodebb:
mongo --shell
use admin;
db.createUser({ user: "mongobos", pwd: "password", roles: ["userAdminAnyDatabase"] });
use nodebb;
db.createUser({ user: "userxxx", pwd: "password", roles: ["readWrite"] });
exit;

Hope this help. I'm just newbie.