Follow these steps to troubleshoot a remote desktop connection error:

1. Make sure that you are connected to the internet.
2. Verify that the remote computer is powered on and connected to the network.
3. Check if your firewall is blocking the connection.
4. Verify that the remote computer is running the latest version of its operating system.
5. Make sure that Remote Desktop is enabled on the remote computer.
6. Check to see if the Remote Desktop connection is set to ‘Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended)’.