Did you try updating Redis?
UNSOLVED Default Admin Password
What's the default admin password?!
I set up my forum but the admin account was pre-registered and the docs don't say what the password is.
Strange, when you run NodeBB setup for the first time the system will ask you to set a password. (The last time i did this anyway)
We use ansible to preconfigure the system.
In that case the installation will not pop up.
We noticed that If the DB has no admin in it, one random password is generated. You can find it in the logs.
If there was an admin already in db. It continues to work.