Heartbeat problem ActiveSync & ISA 2006

Posted on 2009-04-03
Last Modified: 2012-05-06
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" (
Question by:xiss
  • 2
LVL 37

Expert Comment

by:Jamie McKillop
ID: 24170277

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.


Author Comment

ID: 24302504
Hi JJ,

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


LVL 37

Accepted Solution

Jamie McKillop earned 500 total points
ID: 24303712
Are you sure your delivery failures are related to this ActiveSync error? Can you provide more info about the delivery failures?


Featured Post

Are your AD admin tools letting you down?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
Local Continuous Replication is a cost effective and quick way of backing up Exchange server data. The following article describes the steps required to configure Local Continuous Replication. Also, the article tells you how to restore from a backup…
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now