Why does 24h2/2025 host give only RDP over TCP?

Question

After upgrading to 24h2, the ability to connect to RDP via UDP disappeared everywhere. However, on previous versions everything is fine, configuring policies and substituting mstsc.exe etc. does not solve the problem. This problem itself was still in insider versions and how could it go in production? This creates some performance issues and network overhead. Of course I really appreciate that 24h2 was rewritten to sse4.2 and it gives a noticeable speed increase everywhere, but however rdp only via tcp messes everything up... The problem still exists to this day and on the latest version 26100.2605 and is exactly the same on the server variant of Windows, and has absolutely no dependence on the client and group policy settings. If a client with 24h2 connects to any old version of Windows, there is UDP. But if there is 24h2 on the host, then only TCP. And what's to be done about it? Reinstalling on 23h2 is not an option as well as switching to other solutions like anydesk... More importantly, why is there no mention of it anywhere? Antiviruses and firewalls, opening ports, etc. have nothing to do with it.

*** Moved from Windows / Windows 11 / Internet and connectivity ***

Answer 1

Hello,

Thank you for posting in the Microsoft community forum.

I understand that you are experiencing issues with unavailability of UDP-based RDP connections when using Remote Desktop Connection (mstsc.exe) after updating version 24H2 (OS Build 26100.2605), and I know this is frustrating. According to your tests, configuring group policies and client Settings also did not enable UDP communication, which worked fine in previous versions.

Since this release, we have received many reports of remote connection failures. Unfortunately, I don't have a specific solution for this vulnerability at the moment. We sincerely hope that you can bring this issue to the attention of Microsoft product technicians through the Feedback Hub so that we can release fixes in a timely manner to improve your Windows experience.

Send feedback to Microsoft with the Feedback Hub app - Microsoft Support

We appreciate your patience and your feedback will be helpful.

Reference:

December 10, 2024—KB5048667 (OS Build 26100.2605) - Microsoft Support

Best regards

Jacen

Answer 2

You are absolutely right. Please keep an eye on this issue, I will support you because I play Baldur's Gate through a remote connection.

Answer 3

Have the same problem

HOST will not use UDP for RDP on 24H2 - Microsoft Community

Answer 4

We have the same issue. Have you found a work around for this yet? Not being able to use UDP protocol for RDP has significantly made performance worst

Answer 5

Hello,

The RDS connection for Windows 24H2 or Windows Server 2025 are only supported with TCP and not UDP.

New Behavior for Windows 24H2 and Windows Server 2025.

Darrell