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How to fix the Bonjour mdnsNSP.dll - This module is blocked from loading into the Local Security Authority?

Ginny Roos 0 Reputation points
2026-06-01T20:43:57.3366667+00:00

I have at least a three programs that use Bonjour including my local network printers. The Bonjour mdnsNSP.dll is being blocked by the Local Security Authority. My computer in running Windows 11 Pro version 25H2 OS build 26200.8457. How can I fix this problem so my programs and hardware work properly?

Windows for home | Windows 11 | Security and privacy
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  1. Manoel Barros 19,265 Reputation points Independent Advisor
    2026-06-02T00:55:47.55+00:00

    Hi!

    LSA is enabled starting with some versions of Windows 11. It blocks unsigned DLLs or outdated services. You should update the services that use Bonjour.

    In the case of iTunes, you can download a more up-to-date version from the website and install it. This will update the app. You can repeat this procedure for several apps that use Bonjour. In the case of printers, check if there is a new driver version for them.

    Also check if Windows is fully updated in Settings > Windows Update > Check for updates.

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