During a license connection from a server to an E3 Viewer, a keep-alive (or heart beat) is applied by default. If an E3 Viewer remains some time without responding, its connection is automatically closed. A heart beat time can be configured by using the License heart beat (milliseconds) item.

The value filled in this field indicates a heart beat period in milliseconds.

If this value is 0 (zero), heart beat is turned off. If this value is not changed, then it considers a default time of five seconds, or 5000 milliseconds. The maximum time an E3 Viewer can remain without sending a heart beat, that is, a time-out on the server side is always doubled the configured heart beat time.