Synology - Docker installation: 8123 not accessible anymore

Installation
1

All of a sudden, I cannot access HA anymore.
My HA is running in Docker container on my Synology NAS for the last months without problems. (I always used the Docker UI for creating new containers from latest images.)
No matter which container I start (0.44, 0.45, 0.46) - it is not accessible using diskstation:8123 anymore. (The same containers where running fine just a few days ago.)
But according to the logs, the container is still running - just it is not accessible.

Ideas anyone?

2

There may be a problem with config

I had fail where hass container was running but UI not accessible.
HASS crashed due to configuration error. Modified config and all OK.