Is it possible to connect a 2nd HA instance to the same mqtt broker?

I am migrating to HAOS and I did not want to do a simple snapshot as I have a lot of legacy files that I did not want to migrate over via the snapshot.

When connecting to my mqtt server I am getting “failed to connect”

I am unsure where the disconnect is. Keep in mind I can ping my mqtt broker IP and the port is exposed etc.

I’m wondering if there is an issue with the discovery or something when you use several home assistant instances?

Does Home Assistant always use the same Client ID to connect? you can’t have 2 connections with the same Client ID, it’s how MQTT handles state.

Hmm good question. Where can I find this Client ID information?

I’m also experiencing this issue with ZwaveJS but that one is a websocket so i’m assuming its obvious that I can’t connect more than 1 websocket to the same ZwaveJS server?

Set the ‘alternative client id’ in the MQTT broker options.

Actually it doesn’t seem to have anything to do with that. I just tried it. I also can’t see any logs anywhere

It should be possible. I have 3 HA instances connected to the same broker.