These instructions cover using a personal computer to connect remotely to your office computer. A common use case is part time faculty connecting to their office desktop computer.
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Troubleshooting - Connection Failure
"This computer can't connect to the remote computer."
This error could mean your office computer is off.
If you get a black screen upon login to your office computer (double hop):
Type CTRL-ALT-END (Windows) or CONTROL-OPTION-FN-LEFT ARROW (macOS) to bring up Task Manager on the remote office computer.
In Task Manager click More Details, then click File > Run new task.
Enter explorer.exe in the box and click Ok.
This should bring back the desktop.
If that doesn't help, again click File > Run new task.
Enter shutdown -r in the box and click OK.
This should restart the remote office computer. Close the remote computer window. Wait several minutes and try to connect again.