Hi everyone,
I’m currently in the process of setting up Home Assistant with the long-term goal of possibly replacing FHEM.
Home Assistant OS is running on Proxmox.
Now I’m trying to integrate Homematic IP Local into Home Assistant, but I’m hitting a persistent issue:
I can’t reach my CCU2 (not RaspberryMatic!) from Home Assistant.
After a lot of searching and reading, I came across a post suggesting that I should use the DNS hostname of the CCU2 instead of the IP address. I tried that — unfortunately without success.
I then went into the Home Assistant shell and tried to ping the CCU2 — but that also fails. The hostname cannot be resolved.
What confuses me:
• Name resolution works fine from all other systems in my network.
• Even from other Docker containers (not part of Home Assistant), I can ping the CCU2 via hostname without any issue.
• The HA DNS settings include my AdGuard server as the primary DNS and Sophos XG as the secondary.
• In AdGuard, I see no DNS requests from Home Assistant regarding the CCU2 — just some general queries like http://checkonline.home-assistant.io.
It really looks like Home Assistant either doesn’t try to resolve the CCU2’s hostname at all, or it uses a completely different DNS path than the rest of my network and containers.
Has anyone run into a similar issue?
Are there any known configurations or workarounds to make Home Assistant resolve local DNS hostnames properly?
Any help or advice would be much appreciated!
Best regards,
Marc