Try the Ubuntu docs instead of the Debian docs. They're more up to date.
I have a fresh install of NodeBB v0.8.1 on Ubuntu (Microsoft Azure VM). Installation and config went smoothly as well as registering a few initial users, etc.
A few hours later new users as well as myself are consistently getting a
Forbiddenerror when trying to login or register a new account.
./nodebb logsimply says invalid csrf token for the
Using redis-server 3.0.3
Current theme: Persona v2.1.25
Thanks for any ideas.