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Once downloading the agent from getting started wizard and installing it from cmd prompt. I find warn log files "Warn RegistrationChannel Could not connect to the controller/invalid response from controller, cannot get registration information"
How to fix this issue?
Can you please cross check if your controller-info.xml file is correctly configured.
You can review the below link which has a sample configuration.
If you config file looks good, you may walso want to check that you are able to reach / communicate to your controller host from your agent host. You can do so by running telnet commands from agent to controller host and port and confirm you have connectivity.