Log Name: Application
Source: MSExchange ActiveSync
Date: 6/15/2010 12:07:43 AM
Event ID: 1040
Task Category: Requests
The average of the most recent heartbeat intervals  for request [Ping] used by clients is less than or equal to .
Make sure that your firewall configuration is set to work correctly with Exchange ActiveSync and direct push technology. Specifically, make sure that your firewall is configured so that requests to Exchange ActiveSync do not expire before they have the opportunity to be processed.
For more information about how to configure firewall settings when using Exchange ActiveSync, see Microsoft Knowledge Base article 905013, "Enterprise Firewall Configuration for Exchange ActiveSync Direct Push Technology" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=905013
Getting this every now and then, is it serious? Should I be worried? Everything working fine, still. There is no ISA only a Sonicwall Firewall.