Event banner
Event details
Configuring Windows device security according to Secure Score's best practice recommendations breaks casting / miracast. Supposedly, something in the network gets blocked (and there's a lot of it!) that stops miracast from connecting to managed devices.
I been totally unsuccessful in figuring out which network security setting causes this - and neither has M365 support been able to pin point this.
Can you provide some DETAILED documentation on which network prerequisites miracast needs to work?
Spoiler: Intel's documentation on it hasn't helped me either.
MicrosoftWithout knowing exactly which policies got set and what was blocked, my suggestion would be to look at your policies that would block any of the protocols used and ensure the firewall settings are not blocking or dropping communication between devices. The Miracast spec here details the protocols used: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-mice/9598ca72-d937-466c-95f6-70401bb10bdb . The driver requirements are also here, if you've had any driver updates, may be related to that as well. https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/wireless-projection-pc-manufacturers Hope that helps.
Yeah, that's exactly what's happening. Secure Score gives excellent and detailed recommendations on hardening a few network settings. But one or more of them also break miracast. We tested: It's not a driver issue, as the same deivces work fine without the network / firewall policies applied.
I'll take a look at the specs you shared, didn't have those yet. Thanks!