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ActiveSync issue, problem with ASG ?

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Hi all,

I have about 50 cellphones that connect to an exchange 2007 cas-only server. In the event log I get error ID 1040 which says :

"The average of the most recent [474] 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."

Can anyone tell me where can I configure this setting in ASG 8.306?

Tnx all
Ilanxp

ASG 8.306

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