Timeout & DirectPush Mail

To optimise DirectPush perf, 3 timeout values need to be fine tuned, they are  firewall, ISA and IIS of Exchange FE server. This is due to the fact that "DirectPush" works by keeping an http connection open to the server (Through a concept called heartbeats, where the mobile device periodically pings the server). If the firewall timeouts before the periodic ping, the device will need to ping/reconnect more frequently and errors might turn up in your eventlog.
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