Antivirus, firewall, or security software (e.g., Bitdefender) is blocking RDP traffic.
Rename-Item -path "C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys" -NewName "MachineKeys_old" : Reboot the server 3. Adjust Firewall & Antivirus Settings Security software like Bitdefender or the native Windows Firewall may block the connection Remote Desktop (WebSocket)
Local Group Policy Editor └── Computer Configuration └── Administrative Templates └── Windows Components └── Remote Desktop Services └── Remote Desktop Session Host └── Security Steps to Change the Policies:
: High packet loss, insufficient bandwidth, or weak VPN encryption ciphers frequently drop the connection during authentication.
This reduces security. Only do this on internal/VPN networks.
: The host machine uses a self-signed certificate to encrypt RDP traffic. If this certificate expires or the MachineKeys directory corrupts, the handshake immediately throws a 0x904 error.
Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security
If the basics fail, your next step is to tame the firewall.
The Remote Desktop Service account (TermService) lacks "Read" permissions to the SSL certificate's private key.
Disable as a test to see if the connection establishes. Summary of Likely Causes Unable to RDP into some Windows Servers - Error code: 0x904
Contenuto consigliato
Antivirus, firewall, or security software (e.g., Bitdefender) is blocking RDP traffic.
Rename-Item -path "C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys" -NewName "MachineKeys_old" : Reboot the server 3. Adjust Firewall & Antivirus Settings Security software like Bitdefender or the native Windows Firewall may block the connection Remote Desktop (WebSocket)
Local Group Policy Editor └── Computer Configuration └── Administrative Templates └── Windows Components └── Remote Desktop Services └── Remote Desktop Session Host └── Security Steps to Change the Policies: Antivirus, firewall, or security software (e
: High packet loss, insufficient bandwidth, or weak VPN encryption ciphers frequently drop the connection during authentication.
This reduces security. Only do this on internal/VPN networks. This reduces security
: The host machine uses a self-signed certificate to encrypt RDP traffic. If this certificate expires or the MachineKeys directory corrupts, the handshake immediately throws a 0x904 error.
Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security If this certificate expires or the MachineKeys directory
If the basics fail, your next step is to tame the firewall.
The Remote Desktop Service account (TermService) lacks "Read" permissions to the SSL certificate's private key.
Disable as a test to see if the connection establishes. Summary of Likely Causes Unable to RDP into some Windows Servers - Error code: 0x904
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