Configuring Global Virtual Portal Settings : Advanced
  
Advanced
Send CTTP keepalive messages every – Select this option to prevent proxy or load balancer servers from preemptively terminating connection between a CTERA Agent and the CTERA Portal. This may be relevant if the CTERA Agent is configured to use a proxy server and there are connectivity problems during Cloud Backup or Cloud Sync. This is because some proxy servers and load balancers are configured to close open connections that are not transferring any data after a certain amount of time, thereby causing connectivity problems.
In the field provided, specify an interval, in seconds, smaller than the timeout value configured on the proxy or load balancer server.