I am unable to connect to an EC2 Windows instance using RDP and receive an error, "The remote session was disconnected because there are no Remote Desktop License Servers available." How can I resolve this?
Last updated: 2021-09-30
The error indicates there is an issue with the Remote Desktop Services host settings on your Amazon EC2 Windows instance.
If you don't need to run more than two concurrent RDP sessions, uninstall the Remote Desktop Service.
If you installed the Remote Desktop services host settings on your Amazon EC2 Windows instance to allow more than 2 concurrent RDP client sessions, then you must purchase Client Access Licenses (CALs). RDS provides a licensing grace period of 120 days. After the grace period expires, you must purchase CALs to allow more than two concurrent RDP user sessions.
For assistance with purchasing and installing CALs, contact your VAR or Microsoft Partner.
If you purchased CALs and receive the error, then the sever might not be reachable by the instance that you're connecting to. For more information, see Cannot connect to RDS because no RD Licensing servers are available.
Uninstall Remote Desktop Services
To uninstall the Remote Desktop Service, run the following Windows PowerShell command as an administrator:
Uninstall-WindowsFeature -name Remote-Desktop-Services -includemanagementtools -confirm
Note: If you still can't connect to a Windows instance using RDP, you might have to perform additional troubleshooting. For more information, see How do I troubleshoot Remote Desktop connection issues to my Amazon EC2 Windows instance?