Worked it out.
In the admin panel:
then tick the 'upload files' box for registered users.
Try using this one instead (it works for me on latest NodeBB)
Giving away your credentials is dangerous, please do not do so.
Let us know the output of /var/log/mongodb, or what happens when you try to start mongo from the command line, thanks.
@pitaj Great! That's good to know!
Dunno what was wrong that day. Did a pull to update, then did the same steps as I had before and it decided to work.