Question : MSExchange ActiveSync Event ID 1040 Annoying?!

Log Name:      Application
Source:        MSExchange ActiveSync
Date:          6/15/2010 12:07:43 AM
Event ID:      1040
Task Category: Requests
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      exchserver.domain.local
Description:
The average of the most recent heartbeat intervals [350] for request [Ping] used by clients is less than or equal to [540].
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.

Answer : MSExchange ActiveSync Event ID 1040 Annoying?!

It should be fine as long as no one is complaining.  You can up the time out of port 80 and 443 to 30 minutes in the Sonicwall.  Also try changing the connection timeout in IIS to 30 mins for the default website and if your running SBS change the timeout in the exchange-oma site.

Are any users using an iPhone?