ERR_CONNECTION_REFUSED - cannot access backend and frontend

[jonis100]

I have a connection issues so I stuck.

I'm using an Orange Pi 3LTS (OS Ubuntu 20.04.6) with Tinycheck installed, and connected by ssh (both behind the same LAN ).
The services (frontend, backend and watchers) are running.

For frontend (http - port 80) I got Placeholder page
For backend (https - port 443) I got connection refused.

Tested from my machine(by using the browser), and from the Orange Pi by using curl.

By netstat -a I saw the ports not in used.
Just remark my Orange Pi was Pi Hole before, but I disabled the service before installation and attempts to use Tinycheck

Thanks in advance for some help
Yoni