@MoJo Ah yeah it looks like you've run into this bug: https://github.com/NodeBB/NodeBB/issues/8515
You'll need to cherry-pick the referenced commit to fix it in your install.
@julian How to configure your server so that it will redirect your subdomain to the correct port (:4567). I also made changes to config.json , but what next .
Please consult the nginx documentation: https://docs.nodebb.org/configuring/proxies/nginx/