[Solved] How to fix Matter Accessory Showing ‘No Response’ in Apple Home App caused by IPv6 mDNS Multicast DNS routing failure between 2.4GHz Wi-Fi and Thread Border Router on HomePod mini

[Liam O’Connor]

Diagnostic Hardware Specs: HomePod mini (Stereo Pair) | OS Version: tvOS 18.1 | Archive Source: Apple Support Community #256861647

I am running into a persistent issue on my HomePod mini (Stereo Pair) running tvOS 18.1.
Whenever the machine encounters IPv6 mDNS Multicast DNS routing failure between 2.4GHz Wi-Fi and Thread Border Router, the following diagnostic log appears in Console:

homed: [Matter] Transport connection dropped for NodeID 0x3ef9: IPv6 unreachable via Thread mesh

I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

HomePod mini (Stereo Pair) | tvOS 18.1

Apple Discussions Contributor | "Verified Apple Diagnostics Archive"

[Sarah Mitchell]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Enabling IGMP snooping / multicast forwarding and rebooting primary Thread Border Router.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. In home router Wi-Fi settings, enable IGMP Snooping and disable ‘AP Isolation’.
2. Power cycle your primary Thread Border Router (Apple TV 4K connected via Gigabit Ethernet).
3. Power-cycle the unresponsive Matter accessory for 10 seconds to prompt a fresh Thread mesh re-route.

Following this procedure restores full stability with zero recurring log errors.

Apple Certified Support Professional (ACSP)

Cupertino, CA | "Precision Apple Diagnostics"

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