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[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 Apple TV 4K

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Home › Forums › HomeKit, Apple TV & Smart Home › [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 Apple TV 4K

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  • November 15, 2026 at 12:57 am #16084
    Mary Bauer
    Community Contributor
    Diagnostic Hardware Specs: Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet | OS Version: tvOS 18.0 | Archive Source: Apple Support Community #256171318

    I am running into a persistent issue on my Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet running tvOS 18.0.
    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 0xf4aa: 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?

    Mac mini M4 Pro (48GB) | Studio Display | HHKB Professional Hybrid | Boston, MA
    Computer Science & Machine Learning Student | "Verified Apple Discussions Archive"
    November 15, 2026 at 12:57 am #16085
    Lauren Reyes
    Community Contributor
    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 Vision Pro (1TB) | Mac Studio M2 Max (64GB) | AirPods Max USB-C | Singapore
    Apple Certified Support Professional (ACSP) | visionOS Spatial Computing Developer
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