Matter server add-on DNSSD errors
maybe you have issues with IPv6 on your network
1.Only IPv4, no IPv6 on the network.
2.Are any of you using multiple LANs/VLANs with multiple network interfaces on the HA host?
If so then you might need to configure your routes.
3.you need to configure is the network binding of the services。
In IPv6 every network interface will have several networks, like fe80::/64, ff02::/16 and so on.
If you have 2 network interfaces, then it means you will have 2x fe80::/64, 2x ff02::16 and so on.
When you then want to contact something on a fe80::/64 network then you need to specify which network interface this is going to happen on. With just one network the operating system will always choose the right one, but with multiple it will choice the one that it finds appropriate if nothing is stated.
This might not be the right one, so the standard have a solution to that, which is to state the network interface ID in the address. The interface ID is added to the end with %ID_number_of_interface.
IPv6 will also add multiple addresses that act differently, like some that will not be routed between networks/VLANs, like fe80, others that can be routed between local networks/VLANs, but not on the internet, like fc00::/10.
And these addresses can exist in stateful versions, where it is controlled totally by a server/router, in a stateless versions, that is controlled partly (the prefix part) by a server/router, also called SLAAC, and also in temporary versions that is handled without any server/router.
https://community.home-assistant.io/t/matter-server-add-on-dnssd-errors/530066