mdnsNSP.dll - This module is blocked from loading into the Local Security Authority

Thank you for the details. I think this is beyond my capabilities (and comprehension). I’ll just keep Bonjour installed and deal with the LSA warnings for now. I can hide the warnings if I get fed up with them.

This issue doesn’t seem to be impacting iTunes usability and that’s better than the Windows Store version that bricks devices during iOS updates and doesn’t allow you to restore. I’m so frustrated with this whole deal and the many hours I’ve spent and lost on this issue.

This is a user-to-user forum. No one here (with VERY limited exceptions) works for Apple If you want Apple to listen, use this link:

Product Feedback - Apple

Also see:

Security implications of Bonjour protocol for developers and administrators - Apple Support

Bonjour hasn't been updated since 2015. Apple would probably like you to install iTunes from the Microsoft Store, or use Apple Music, TV & Devices instead. (Don't, they're not a good replacement).

tt2

Also played around with Bonjour as separate installer. The current version is 3.1.0.1 from 2015 (extracted from iTunes installer). Also found: Download Bonjour Print Services for Windows v2.0.2 - Apple Support which gives you an even older version...

Updates to and reinstallation of version 3.1.0.1 do not fix the LSA warning.

My summary: Uninstall Bonjour (if not needed) or hope to get an updated version.

uninstalled itunes and bonjour, and got itunes from the apple website instead, warning has gone and itunes now recognizes phone, so all good. GL to you.

You can extract the Bonjour .msi file from an iTunes installer so you can install that component independently should you wish. See the bottom of Troubleshooting issues with iTunes for Windows updates - Apple Community for links to a number of versions of the iTunes installer and in particular the section on Missing MSI errors.

tt2

Perhaps it is past time to say Au Revoir and Bon Débarras to the decrepit Bonjour the ole heave-ho to the bin and join Flash, Java, Silverlight, QuickTime and OSX. Unfortunately, it my HP printer won't scan to my desktop as it did flawlessly in Windows 10 for over 8 years. I have no hope "Apple Cares" to even look at Bonjour, much less pay the $300 sign-up fee to sign the app as it is the newest episode of the "Walking Dead"

Do you use AirPlay or sync over Wi-Fi? If not then I don't think you need Bonjour at all.

tt2

exact same thing happened to me yesterday, repair shop had to reset to factory, phone fine on 18.2 now but is no longer recognized by itunes (from MS store), works fine on my wifes laptop (with itunes from MS store), havent tried dling form apple direct, but today i get the same popup, wish there was an easy alternative to get audiobooks onto my phone from PC.

Short summary on this one as problem still exists: Since Local Security Authority (LSA) protection is on per default starting with Windows 11 24H2, this prompt will appear. Bonjour might be installed through iTunes or other third-party software (like Printix that simulates AirPrint). Only fix so far, is an uninstallation (if not needed any more). If needed, there is no solution. Also, Microsoft does not offer policies to define exclusions. Turning of LSA can't be seen as acceptable solution.

In the end, Apple needs to fix their Bonjour DLL. Currently, it is not fulfilling the requirements defined by Microsoft like "digitally signed with a Microsoft signature": Configure added LSA protection | Microsoft Learn

Yes, uninstall iTunes and reinstall, then remove bonjour from Settings - Apps - Installed Apps and you'll find Bonjour. I used the registry method in a previous post and it fixed it for me and kept bonjour.

The windows store one bricked my iPhone 15 Pro when I figured it was best to have the latest iTunes. Big mistake. The old iTunes saved the day and had my backup (I back up my phone before updating as always).

Shame we have to just ignore but at least it’s an option on windows 11 to hide it 😅

Same problem here. Bonjour 3.1.0.1 was installed on this Windows 11 machine ~2015, but there seems to be a 2025 update. The DLL is from 2015. However, Bonjour.Resources was changed in 2025.

I think it has to do with the iCloud app/software installed since I removed iTunes etc. a long time ago. I will give it a try and uninstall Bonjour as I have not found any other ways around (exceptions) and hope that iCloud continues to work.

Bottom line: Only Apple can (must) fix this.