Login is running withoud end. No error message. Anyhow, the doctor gave a hint. Looks like app cannot be started.
root@debian-4gb-nbg1-1:/var/discourse# ./launcher start app
starting up existing container
+ /usr/bin/docker start app
Error response from daemon: driver failed programming external connectivity on endpoint app (34a973985c824743faf32d44ba96b910b54adb3413a9f2de411cd6fe2b122d8d): Error starting userland proxy: listen tcp 0.0.0.0:80: bind: address already in use
Error: failed to start containers: app
Any idea what this issue is pointing to?