If a container is not in the `Up` state, check the log file for that container in `/var/log/harbor`. For example, if the `harbor-core` container is not running, look at the `core.log` log file.
When setting up Harbor behind an `nginx` proxy or elastic load balancing, look for the following line in `common/config/nginx/nginx.conf` and, if the proxy already has similar settings, remove it from the sections `location /`, `location /v2/` and `location /service/`.