Configuring local Time-Server

Installation
1

As far as I have read in divers documentation the problem, that HA does not start if no internet connection is active seems to be depending on the fact that all time server are in the internet (remote).
But I have no way found to define a local time server for the time service.
(did not work too: Changing the NTP Server in HassOS - LedHed's Wiki)

I use Raspberry Pi 4B with the downloaded HA image.
Almost recently updated:
Core 2025.5.0
Supervisor 2025.04.1
Operating System 15.2
Frontend 20250507.0
In my local network I have two DHCP-Server and two local Time Server (one with GPS).
I have already added both DHCP Server to the DNS list in the Network configuration. My Phoscon Gateway has no problem an works fine also without internet.
But HA does not come up with the GUI if there is no internet connection.
Any help is warmly welcome
Gerald

2

Use chrony, and set the ntp_server to your GPS local time server

3

Do you know where I can find the configuration files?
Icould not find any line.

4

In the tab configuration of the add-on

5

I found the configuration and changed to “server” instead of “pool” and provided the two local ip addresses of the time server.
But IT DID NOT WORK!
As I rebooted the HA it waited as long as the connection from my local network to the router was reestablished. Then HA came up again and worked as usual.
Without internet connection even the ping to HA was not successfull!
What else can I do ?