Windows Holographic 21H1版本下HoloLens 2网络及相关功能异常问题求助

Hey there, sorry to hear you're hitting all these roadblocks after upgrading your HoloLens 2 to the 21H1 Windows Holographic build. Let's break down what's likely going on and how to fix it, based on the details you shared:

1. Unity & Visual Studio Version Constraints for 21H1 #

Windows Holographic 21H1 (built on Windows 10 21H1, ~build 19043.x) has stricter compatibility requirements for your development stack, and your current tools are a bit outdated for this OS version:

• Visual Studio 16.4.5: Released in late 2019, this version predates the 21H1 release and lacks the necessary SDK updates and OS-specific bug fixes. Microsoft recommends using Visual Studio 2019 16.11.x+ (LTS) or moving to Visual Studio 2022 for targeting 21H1.
• Unity 2019.4.7: While it's an LTS release, early 2019.4 versions don't have full support for the 21H1 HoloLens APIs. Upgrading to Unity 2019.4.30+ (the latest 2019.x LTS) or Unity 2020.x LTS will get you patches for newer Windows Holographic builds.

2. Mixed-Reality-WebRTC ARM Plugin Crashes #

The ARM-specific plugin failing post-upgrade almost certainly ties to compatibility with the 21H1 system APIs:

• Newer OS versions often modify system-level libraries that plugins depend on. Check if there's an updated version of the Mixed-Reality-WebRTC plugin that explicitly targets Windows 10 21H1.
• If you're using a custom-built plugin, rebuild it using the Windows 10 SDK 10.0.19041.0 or later (the minimum SDK required for 21H1) to ensure it works with the new OS's underlying components.

3. DevicePortal Virtual Input Failure #

DevicePortal functionality can break after OS updates due to changes in the portal service or input APIs:

• First, make sure your DevicePortal is running the latest version—refresh the portal page or restart the service via Settings > System > Remote Management to trigger an auto-update if needed.
• Double-check that the Virtual Input permission is still enabled in DevicePortal (under "Device capabilities"). OS updates sometimes reset these settings without warning.

4. DatagramSocket & Networking Exceptions #

Your Windows.Networking.DatagramSocket issues are likely tied to 21H1's stricter network isolation rules or API changes:

• Verify your app's package capabilities in Package.appxmanifest are correctly set. For DatagramSocket, you'll need InternetClientServer and possibly PrivateNetworkClientServer (depending on your use case). OS updates can sometimes reset capability flags or require additional declarations.
• Enable verbose logging in your app to capture the exact exception message (e.g., access denied, socket conflicts). 21H1 tightened network isolation for UWP apps, which might block connections that worked in older builds.
• Test with a minimal, standalone DatagramSocket sample app. If the sample works, the issue is in your app's implementation interacting with the new OS, not the library itself.

Quick Next Steps #

Start by updating Visual Studio and Unity to the recommended versions—this will eliminate most toolchain-related compatibility gaps. From there, test each issue individually to narrow down remaining problems.

内容的提问来源于stack exchange，提问作者JJCodesFresh