Error Restarting Agent: Already Listening on a Configured Port

When attempting to restart the agent, you may encounter this error if the agent didn't shut down correctly:  

* Starting Datadog Agent (using supervisord) datadog-agent
Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord.

To resolve this issue, please take the following steps: 

  1. Stop the agent:
    sudo /etc/init.d/datadog-agent stop
  2. Confirm that there are no processes running for the user dd-agent after stopping:
    top -U dd-agent
  3. If you do find processes running under dd-agent, please kill them.
  4. After the above steps, please start the agent:
    sudo /etc/init.d/datadog-agent start

If this doesn't solve your issue, please reach out to support@datadoghq.com.

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