Remote Credential Guard double-hop issue after server 2022 upgrade

Question

we upgraded two of our jump/admin servers from server 2019 to server 2022. one was installed fresh, the other one was upgraded via inplace upgrade.

now mstsc /remoteguard no longer works correctly, we seem to run into a kerberos double-hop issue.

what we do is, we logon to the admin server as usual with credentials. then from the admin server we use mstsc /remoteguard to jump to a different machine. on the destination machine, upon opening network shares we receive the message:

"The system cannot contact a domain controller to service the authentication reuqest. Please try again later."

this did not happen before the upgrade. everything still works fine when starting from a server 2019 admin server.
no group policies, security settings or other modifications were done the infrastructure.
anyone else experiencing this?

Answer 1

We are running our VMs on Hyper-V (Guarded Fabric with Shielded VMs) , so the comparison will be difficult.

You probably don't have vTPM on you VMs (in our case the CLIENT needs to be VBS Capable , so with a TPM and Set-VMProcessor -VMName 'CLIENT' -ExposeVirtualizationExtensions $true )

Answer 2

hyper-v .... i guessed so. thanks for confirming..... :)
let's see what MS support has to say about this.
thanks again!

Answer 3

Hi
Please install the KB5011831 on client and check it again
https://support.microsoft.com/en-us/topic/april-25-2022-kb5011831-os-builds-19042-1682-19043-1682-and-19044-1682-preview-fe4ff411-d25a-4185-aabb-8bc66e9dbb6c

"Addresses an issue that causes Kerberos authentication to fail, and the error is “0xc0030009 (RPC_NT_NULL_REF_POINTER)”. This occurs when a client machine attempts to use the Remote Desktop Protocol (RDP) to connect to another machine while Remote Credential Guard is enabled."

Answer 4

FYI,
the issue has been fixed with august preview update "windows10.0-kb5016693-x64_cdae6466553f8a5025611babab46598380a5b83e.msu"