Windows Update Broke Remote Desktop Complete Fix Order

An update can change Remote Desktop in three different ways, and each one has a different cure. One: you open a saved .rdp file and a new security warning appears — nothing is broken, this is a new safety check doing its job, and it is covered in Fix 2. Two: the connection is refused, times out, or closes right after the password — a setting or the update itself flipped something, covered in Fixes 3 to 7. Three: administrator accounts connect but standard users fail with error 0xC000000D — that is a separate Microsoft known issue tied to Administrator protection, and it has its own companion guide on this site, named in the note at the end of this page. Do not mix the three: the registry tweak that helps one can hurt another.

1. Restart the host (the PC you connect to) and the client — a half-finished update leaves services in a stuck state that only a restart clears
2. Confirm both machines are on the same network, or that your VPN is connected first, exactly as it was before the update
3. Try connecting by the host's computer name and then by its IP address — if the IP works and the name does not, you have a name-resolution issue, not a broken Remote Desktop

1. On the host, open Settings, System, Remote Desktop and confirm the Remote Desktop switch is still On — confirm it even if it was on before the update
2. The same state from the classic panel: open sysdm.cpl, go to the Remote tab, and make sure Allow remote connections to this computer is selected
3. Command-line check for admins: reg query "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections — a value of 0 means connections are allowed, 1 means they are denied
4. Restart the Remote Desktop Services service (services.msc, service name TermService) if the switch was on but nothing answers

1. Still in sysdm.cpl on the Remote tab: if Allow connections only from computers running Remote Desktop with Network Level Authentication is ticked, every connecting account is authenticated before a session is created — older clients can fail at exactly this point
2. Click Select Users and confirm every non-administrator account that needs access is listed in the Remote Desktop Users group — administrators are allowed automatically, everyone else is not
3. Add a missing account from an admin Command Prompt: net localgroup "Remote Desktop Users" rdpuser /add (replace rdpuser with the real account name)
4. Do not untick NLA permanently just to make an error disappear — note it as a test, and put it back once you know the cause; NLA is a real security layer

1. Open Control Panel, Credential Manager, Windows Credentials and find the entry starting with TERMSRV/ followed by your host name
2. Remove that entry, then connect again and type the password by hand — updates frequently invalidate the stored credential, and the saved copy keeps failing silently
3. If the host account is a Microsoft account, sign in with the full name form, for example MicrosoftAccount\[email protected], and the account's real password — not the Windows Hello PIN
4. Check the host account's password has not expired — a forced password change shows up first at remote logon

1. Open Settings, Windows Update, Check for updates and install anything newer — Microsoft ships corrections for update-caused problems in later cumulative updates and occasional out-of-band fixes, so the newest patch is often the cure
2. If the break started with one specific update and no fix exists yet, go to Settings, Windows Update, Update history, Uninstall updates, pick that one update and uninstall it, then restart the host
3. PC will not boot into Windows at all? Use the recovery route: Settings, System, Recovery, Advanced startup, then Troubleshoot, Advanced options, Uninstall Updates, Uninstall latest quality update
4. After uninstalling, use Pause updates for a short period so the same update does not return the same night — and note the date, because pausing is a bridge, not a destination