I am experiencing EventID 3033 'Server ActiveSync' warning events on our Exchange 2003 SP2 server described in KB905013 (see below), apparently due to firewall timeouts.
The Exchange server is behind a Red Hat Enterprise Linux 5.4 iptables based firewall, but I don't know what settings to check to make sure that the HTTP(S) timeout is set to at least 15 minutes as described in the article.
Can anyone tell me where the settings are that affect iptables firewall timeouts in Linux and how I can change them?
Event log error follows:
Event Type: Warning Event Source: Server ActiveSync Event Category: None Event ID: 3033 Date: 08/10/2009 Time: 10:42:35 User: <REMOVED> Computer: <REMOVED> Description: The average of the most recent  heartbeat intervals 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).