Check that the data source is configured correctly and the machine is connected and powered on.

If you are still getting a timeout error, the Run test connection (details below) may be getting blocked by your computer/network firewall. Either try using a different network or contact your IT to make sure the test is not getting blocked.

If the above is all in order, your machine may not be responding in a timely manner (timeout details below). That may be due to high CPU load or simply outdated hardware.