Troubleshooting RDP Error: "Because of an error in data encryption, this session will end"

The error message "Because of an error in data encryption, this session will end" is a common issue encountered when using Remote Desktop Protocol (RDP) to connect to remote systems. This error typically occurs due to problems with encryption settings or data transmission during the RDP session.

Verify Encryption Settings:

Ensure that the encryption settings for both the RDP client and server are compatible. On the server side:

Type gpedit.msc in the Start menu to open Group Policy Editor.

Navigate to:
Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security.

Ensure the Encryption Level is set to a compatible value (e.g., High).

Reset Network settings:

Run CMD as an administrator.

Now, Run the following commands individually:

netsh int reset all

ipconfig /flushdns

netsh int ip reset

netsh winsock reset

Check Network and Firewall Configuration:

Ensure that the network and firewall settings are not interfering with the RDP connection:

• Verify that TCP port 3389 is open and not being blocked by firewalls.
• Use network tools (e.g., Telnet or PortQry) to check the connectivity to the RDP port.
• Confirm there are no intermittent network issues causing packet loss.

Reinstall or Replace RDP Certificates:

Type certmgr.msc in the Start menu to open Certificates Manager.

Verify the status of Remote Desktop certificates and Replace or renew any expired or invalid certificates.