Ralkage [deleted] what do you mean by maintenance site? Is there a specific message you are getting? Do you have any relevant screenshots or more detailed information?
[deleted] Ralkage I just want to let people see "hey we are working on something" but i can still access the site.
clarkwinkelmann [deleted] Flarum does not has this feature, only a global maintenance mode that prevents access to the webapp completely. It shouldn't be too hard to develop a block-non-admins maintenance extension.
clarkwinkelmann You could also do it outside of Flarum. Setup an IP whitelisting at the webserver level, and customize the error page for unauthorized IPs. This is doable for any kind of website.