Home assistant not responding to http://homeassistant.local:8123/


Not sure if this is the right place to ask, but my home assistant server has stopped responding to http://homeassistant.local:8123 and now only answers to <http://[IP Address]:8123.

I don’t think I’ve changed anything, its just stopped working all of a sudden.

Any ideas?


That would be a DNS issue at the router in home. Make sure mDNS (munticast and unicast) are enabled on the router. Is your computer and HA on the same subnet of addresses (like 192.168.1.X) and not on separate subnets (like 192.168.30.X)? Any VLANS? Did you isolated the VLANs (no communication between them)?
Any firewall rules or traffic rules?

Is the HA on a static address versus a DHCP lease address?

Thanks for the tips,

My HA has a static address which I can connect to. Now you mention subnets… yes it’s assigned IP address is on the same subnet for the home network (192.168.1…). However, I am running HA on a PROXMOX virtual machine, so maybe that has something to do with it.

Just for clarification, mDNS doesn’t need anything enabled. A client asks to every machine on the same subnet: “are you homeassistant.local”?

@koying My Unifi UDMP has a setting to enable mDNS but I believe it just allows mDNS to work across VLANs. mDNS reflector?

When I had the same issue, it was due to issues related with having another instance of HA where I had not changed the default host name. I can’t recall exactly the details other than it driving me nuts until I powered down the other instance and things started working again. If I recall correctly, I was not getting the UI of the other instance but rather an error… maybe due to 2 machines claiming to be the same host.

I beg to have a different opinion on that. Ubiquiti both the Edgemax and Unifi lines need to have those enabled. Others may not, I mentioned it as a check list item. Also depending on what hardware the HA is running on, updates can an do break things (as in no longer working). So that is another thing to check on. (both the main OS and the VM)

It’s not a matter of opinion, it’s just how mDns work :wink:
Just do a search and read.

Routers might do proxying in case of multiple vlans, but that’s an “extension” of the protocol.