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[Solved] Matter Accessory Showing ‘No Response’ in Apple Home App on HomePod OS 18.1: Diagnostic steps and permanent fix

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Home › Forums › HomeKit, Apple TV & Smart Home › [Solved] Matter Accessory Showing ‘No Response’ in Apple Home App on HomePod OS 18.1: Diagnostic steps and permanent fix

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  • November 14, 2026 at 6:41 pm #10191
    Nina Patel
    Apple Master (Lvl 10)
    Diagnostic Hardware Specs: Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet | OS Version: HomePod OS 18.1 | Archive Source: Apple Support Community #256873841

    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 0xd4d8: 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?

    Apple TV 4K (3rd Gen) 128GB Wi-Fi + Ethernet | HomePod OS 18.1
    Apple Discussions Contributor | "Verified Apple Diagnostics Archive"
    November 14, 2026 at 6:41 pm #10192
    Marcus Reed
    Administrator
    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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