Good morning everyone! I wanted to share a problem I encountered after installing the Windows update KB5070881 last night. It seems that this update caused users to be unable to log into the Remote Desktop Services (RDS) Farm. Specifically, the Remote Desktop clients threw an error code: 0x3, along with a detailed error code of 0x408 when trying to connect. After I uninstalled the update using the command 'wusa.exe /uninstall /KB:5070881' and restarted the server, users were able to log in again. I hope this helps anyone who might face similar issues!
3 Answers
If you're using Server 2025, expect some hiccups. The domain controllers can also be problematic. We're finding that disabling UAC seems to alleviate many issues we face.
UAC issues can really be a pain. I wish they’d sort that out in updates!
I guess I got lucky—I installed KB5070881 on October 29th and haven't had any problems with logins so far. Did you reboot after the update? I’d love to know how big your server farm is and if you’re using native GPUs.
I did reboot, and my farm isn’t that huge, but we do have a mix of hardware. Just curious if that might make a difference!
It's frustrating to see issues like this pop up again; it's the second time this year that RDS has been impacted by a Windows update. Something definitely needs fixing with Microsoft’s update process.

Totally agree about Server 2025 not being the smoothest experience. Glad to hear disabling UAC worked for you!