I am trying to run a private instance for a web application. When I select start test after entering any website URL, eg - http://www.google.com/ I am getting error message stating - “Relay: Invalid API Key”
Sounds like you are trying to relay tests to the public instance (in which case you need an API key and testing is limited). For a completely stand-alone private instance you’d be setting up the agent as well and that location won’t be a relay.