kPow populates the UI with data retrieved from the back-end service via websockets.
If your browser is unable to make a websocket connection to the kPow service you will see the error:
Connection lost. Retrying in 5 seconds.
The most common cause of this error is a reverse-proxy between your machine and the kPow back-end service that has not been configured to allow websocket traffic. Firewalls may also block this traffic.