RDS SSO with delegated credentials fails after installing 2022-10 updates

dadom 21 Reputation points


KB5018410 on W10 21H2 with its new mstsc.exe kills our local Single-Sign-On experience on a Server 2019 RDS farm which has worked for several years. KB5017380 (the 2022-09 preview update that was on WSUS for one day in September) did the same.

Clients without that update are still working fine. An affected client is working again after uninstalling the update or manually replacing the mstsc.exe and corresponding dll from a client that has not yet received the update.

We are using one 2019 RDS Broker with a valid certificate and several RDSH. GPO sets the delegation of standard credentials as well as the trusted SHA thumbprint of the cert. No Web Access or gateway in use, only local connections.

When trying to log on using a predefined .rdp file and the logged-in client user credentials (SSO), the server shows "Other user: invalid username or password" on a regular Windows 2019 login screen with picture background. After clicking OK, the username field is already filled and when you type your password manually, you get logged in. The session itself seems to work properly, once logged in.

Broker eventvwr shows lots of event IDs 4625/4648 with code 0xC000006D/0xC0000064. No matter which RDSH an affected clients gets redirected to, result is the same. It's clearly related to the mstsc.exe build (.2075) of the client. Servers did not get installed 2022-10 updates yet. Similar for W11 clients that got updated.

Other admins on different forums have confirmed they are having the same issue, no solution yet.

Disabling UDP does not change this.

Any ideas? Thanks!

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  1. THOMAS PROEHL 0 Reputation points

    Any Updates on this?

    We try to connect from Win11 22H2 (updatestate August 23) to a 2022 RDP Farm. Always „false credentials“. This also happens from Win11 to 2016 RDP Farm.

    The named Flag is set doesnt work. What mstsc.exe version from what basesystem will work? Tried a 2022 mstsc Version. No Luck.

    Win10 with the same GPO‘s and settings work as expected.