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We are experiencing a reproducible issue with Remote Credential Guard (RCG) when connecting from Windows 11 24H2 clients to a Windows Server 2025 RDP host. Remote Credential Guard works correctly before installing update KB5072033 on the client. Immediately after installing this update, RCG stops functioning.
The issue is fully reproducible and affects only Windows 11 24H2 clients where KB5072033 is installed. The Windows Server 2025 host has also received the December cumulative update, but this does not change the behavior: RCG still fails when the client has KB5072033 installed.
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Microsoft, any progress in this? it is a showstopper for Server 2025 deployment!!
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Sadly April Updates didnt fix it either
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not tested yet but promising :)
*
--edit
KB5083631
Installed on a 25H2 Windows 11 client still doesnt fix the issue,
When remoting to Windows Server 2025 - second hop doesnt work for network drives,
When remoting to Windows Server 2022 - second hop works as expected.
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if source and target machine have got KB5083631 installed, both web sso and network share access seems fixed during my initial tests.
scenario's tested:
Windows 11 25h2 --> rdp /remoteguard to windows 11 25h2
Windows 11 24h2 --> rdp /remoteguard to windows 11 25h2.
Thank you SteveS :-p
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I can confirm it works from Windows 11 25H2 to Windows Server 2025 with mentioned KIR fix.
@MTG If the RD Session Host role is installed on the server, RCG must be enabled at the GPO level (client). It does not work with the mstsc.exe -remoteGuard parameter.”
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Hi Adam.
I can confirm it works from Windows 11 25H2 to Windows Server 2025 with mentioned KIR fix.
Now that puzzles me. That fix is active at my target server, active for months and no, we don't use /remoteguard, but have it required using GPOs. All three KIRs are enabled (for comparison, look at the screenshot, please):
Let's compare: server build is 10.0.26100.32860
Client is 10.0.26200.8457 - same for you???
Hi @MTG , I have only KIR 251003_17001 installed and enabled. My server si same build "10.0.26100.32860", and multiple W11 24/25H2 clients confirmed working. What is your error ?
@Adam Karas Are you sure that you use the same client version, please share it. My error? The same as 2 years ago when all this started: Try to access a domain resource from within an RDP session that was initiated from Win11 24/25H2 on server 2025 and you'll get a reauthentication prompt immediately. No error, just the need to reauthenticate which defies the purpose of remote credential guard completely. The KIR was working, but just when Server 2025 was accessed from older OS' like Win11 23H2, it never worked for 25H2. If, like you, I only activate KIR...17001, it doesn't change a thing. Weird. Sure that you get that right? Some people RDP into already authenticated console sessions - then, logically, the problem never surfaces. So please share your client version and proceedings.
@MTG This is/was my error on WSrv 2025 (double hop). Client W11 10.0.26100.7171 or 26220.8474, both working. Ping me on email (should be visible in my MS profile), dont want to spam here, I hope I can help you, spent lot of days troubleshooting RCG issues.
Thanks, same error here. However, be aware that your 26220.8474 is no stable release but a preview release and that 10.0.26100.7171 works here, too. So I wonder if you can test with a simple w11 25H2 with may update: 10.0.26200.8457
@MTG Yup, thats my personal insider preview version. I don't have clients updated with May update yet, but I don't think this update will have any effect.
Just so that you understand: the versions you use have no problem. I knew that before. But that are not the stable 25H2 versions that we use. Those still have the problem when RDPing to Server 2025!
@MTG just tested with 26200.8390, working.
Then tell me what you might be doing differently. Me and others have observed that it does not work despite the KIR being active. So my steps for reproduction are: Windows domain, join both devices, install may updates, apply KIR - broken. No other GPOs active apart from that that requires remote credential guard.
Microsoft appears to have finally fixed the Remote Credential Guard issue with the August cumulative update for Windows Server 2025 (KB5120233), even though the fix is not mentioned in the KB's release notes.
Initial testing has been successful, both with and without the Known Issue Rollback (KIR) applied.
The Kerberos double-hop authentication scenario is working correctly again.
Let's hope this fix is here to stay this time.
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It's still not working for me, Fully patched Windows 11 25H2 client to Windows 2025, getting the same issue with double-hop if I don't have thte KIR applied. Works fine with the KIR.
I assume it must still be in a slow rollout phase for some reason.
It's the Windows Server 2025 that must be patched, not the Windows 11.
Sorry, i should have been more clear. Both systems are fully patched with the August 2026 CU's; The server update build is 33296.
Fix wasn't implemented for Windows Server 2025 with KB5087539 (build 26100.32860)
Remote Desktop with Remote Credential Guard still doesn't work for a fully patched Windows 11 24H2/25H2 client connecting to fully patched Windows Server 2025 RDS Server.
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This is beyond infuriating; MS fix your stuff.... Am I supposed to forego two months of security patches just because you can't ever figure out remote credential guard. Remote Credential Guard is an ESSENTIAL security feature. DO BETTER!
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Hi, just wanted to add to this for exposure but this greatly upsets our workflow with RCG constantly breaking. Microsoft please get this on your radar!
I would like to sincerely know why Microsoft consistently demonstrates poor QA around Remote Credential Guard with their updates. RCG should be used by every organization and as such should also have better assurance that when an update comes out, that it's not going to break core functionality that this security enhancement provides. I've personally been dealing with these issues for 2 years like a game of whack-a-mole...
