Firewall config for ActiveSync Push

Hello, I' ve been seeing errors from MS Exchange 2003 related to a firewall setting that I' m not sure how to modify. The recommended configuration described in the [link=http://support.microsoft.com/kb/905013/en-us]article[/link] don' t translate to my FortiGate very well. Has anyone else had to make this change? Thanks. Source: Server ActiveSync Event ID: 3033 The average of the most recent [200] heartbeat intervals 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).