@pitaj not on any incoming connection. I just solved it. When I set url to http://127.0.0.1 AND bind_address at the same time, then it works. Setting just one does not. Weird behaviour IMHO. Thanks for the help anyway!

@julian It does not work. With all the different options I end up with nodebb binding to 0.0.0.0 It gets the port right and if I change the port and restart it will bind to the correct port, but always to 0.0.0.0, no matter what I set as IP.

No matter what I write into config.json, nodeBB keeps glooming on 0.0.0.0. I have tried
"url": "http://127.0.0.1"
"url": "127.0.0.1"
"url": "http://127.0.0.1:4568"
"url": "127.0.0.1", "port": "4568"
"bind_address": "127.0.0.1"

I have to bind to a local IP, because I am behind an NGINX proxy.

Read the docs, searched the forum, any hints what to try next?