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ERROR_CTX_ENCRYPTION_LEVEL_REQUIRED
ERROR_CTX_ENCRYPTION_LEVEL_REQUIRED means the target Session Host requires a stronger RDP encryption or security configuration than the client negotiated. It can follow a Group Policy change, an outdated client, or a TLS/certificate configuration mismatch.
What to check
- Use a current Remote Desktop client and compare its settings with a client that connects successfully.
- Review effective RDS security and encryption policies on the Session Host, including policies that override local listener settings.
- For TLS-based RDP, verify the server certificate and private key instead of lowering the required security level.
gpresult /h C:\Temp\rds-policy.html
Microsoft: Remote Desktop Services system error codes
Microsoft: Troubleshoot Remote Desktop disconnected errors
Microsoft: Remote Desktop Services policy settings
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