Heartbeat problem ActiveSync & ISA 2006

I am recieving a lot of 'delivery failures' since three days ago, and they appear to come from a ActiveSync/ISA problem. The below error i get out of my server. I allready checked the ISA Server Web Listener time-out and this is set to the recommended 1800 seconds. I still recieve all the error and Delivery Failures. Has anybody got any idea where this error is comming from and how to resolve it?

Bart Velt

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).
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xissAsked:
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Jamie McKillopConnect With a Mentor IT ManagerCommented:
Are you sure your delivery failures are related to this ActiveSync error? Can you provide more info about the delivery failures?

JJ
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Jamie McKillopIT ManagerCommented:
Hello,

On your web listener, go to the Forms tab then click Advanced. Make sure the box beside "Apply session timeout to non-browser clients" is unchecked.

JJ
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xissAuthor Commented:
Hi JJ,

Sorry for the late response this doesn't fix the problem the box is allready unchecked. Any suggestions?

Thanks,

Kasper
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