Here a mockup how it could look like on nodebb.org forum:
I just wonder if there is a possibility to make a real private forum:
thanks for your help, and thank for the entire work you've already done
Right now, you can disable registrations in the control panel. We do not have functionality for disabling posting for non-authenticated users.
You can also restrict access to categories in the "Access control" modal, so that only registered users can view the forum.
OK Thanks @julian ,
I will try to create something like this by myself, maybe it 'll be useful for somebody else.
If you create it as a plugin, you can be sure that others will use it. Restricting posting to authenticated users is a sure way of reducing spam postings
If somebody is interested in a partial solution
That's work for me.
But verify the lines in GitHub (around February, 1st), it doesn't match now.