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: If NLA is enabled on the remote computer, and there's an issue with your credentials or NLA configuration, you might see specific errors.
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On the RD Gateway server:
Try these solutions in order. Each step solves a specific subset of error code 0x904 scenarios. : If NLA is enabled on the remote
Use PowerShell to see if the RDP port (3389) is actually reachable: Test-NetConnection [TargetIP] -Port 3389 4. Registry Fix (Client-Side)
Unlike common RDP errors (like 0x4 or 0x516), this specific combination is relatively rare and points toward deep-seated issues with the Remote Desktop Gateway (RD Gateway), SSL certificate mismatches, or UDP transport failures. Many online forums leave users at a dead end, stating "reinstall Windows" or "check your network."
Ensure no typos and that the remote PC is actually turned on and connected to the internet. Use PowerShell to see if the RDP port
Test-NetConnection -ComputerName <Server> -Port 3389
is a common Windows error that signals a transport-level failure during secure channel negotiation, unstable network conditions, or faulty TLS certificate binding. It frequently occurs after upgrading to Windows 11 or configuring newly deployed Windows Servers (2019/2022).
: Open Require user authentication for remote connections by using Network Level Authentication . Switch this policy to Disabled . disconnect and reconnect.
Reconnect to VPNs, as unstable connections often trigger this error.
If you are on a VPN, disconnect and reconnect. Often, MTU (Maximum Transmission Unit) size issues on a VPN cause the 0x7 extended error.