Https works locally, but suddenly not externally

Duckdns has been working for long time. Suddenly external url stopped working.
getting errror: Loading data—>Unable to connect to Home Assistant.
I do not find any errors inn logs when trying to connect, or after booting

https://xyz.duckdns.org/lovelace/'      does not work, did work before
'https://192.168.10.11:8123'    still works with wrong certificate warning'
'https://homeassistant.local:8123/lovelace/'  still works

Ping answers on all above addresses.

seems that ssl trafic is not routed correctly inside OS or core?
Any ideas?

I tried to chage IP address, and NAT configuration, i upgraded os and core.
Tried to disabled SSL, reinstalled duckdns.
I em running on NUC with Home Assistant OS 6.0 and core-2021.6.3.

Fixed it myself.
Rebooted fiberbox and router.
Thanks