Remote Desktop Connection: Error Code 0x904 Extended Error Code 0x7

To fix a problem, you must understand it.

When combined, these errors tell a clear story: Your RDP client and server cannot complete a TLS handshake. The server may support only older, insecure protocols (like RDP Security Layer instead of TLS 1.0/1.1/1.2), or a network device is interfering with the encrypted traffic. To fix a problem, you must understand it

If business continuity is critical and you cannot immediately resolve the TLS handshake: When combined, these errors tell a clear story:

certlm.msc

Navigate to Remote Desktop folder, delete all certs there.
Restart Remote Desktop Services – new cert auto-generates. If business continuity is critical and you cannot

NLA requires the client to authenticate before a full RDP session is created. If the client OS (e.g., Windows 7, older Windows 10 build) or RDP client (Microsoft Remote Desktop for Mac) does not support the NLA version required by the host, error 0x904 + 0x7 appears.