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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 5:24 am #20385
    Adam Dixon
    Community Contributor
    Diagnostic Hardware Specs: Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet | OS Version: HomePod OS 18.1 | Archive Source: Apple Support Community #256413389

    I am running into a persistent issue on my Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet running HomePod OS 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 0xccff: 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 Pro M2 Ultra | Dual Pro Display XDR | Blackmagic UltraStudio 4K Mini | Zurich, CH
    Final Cut Pro / DaVinci Colorist & Editor | "Verified Apple Discussions Archive"
    November 15, 2026 at 5:24 am #20386
    Jean Parker
    Certified Tech (Lvl 5)
    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.

    MacBook Pro 16″ M3 Max (128GB) | SanDisk Professional G-RAID Shuttle 4 | Austin, TX
    Apple Certified Support Professional (ACSP) | Final Cut Pro / DaVinci Colorist & Editor
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