Hi all. I'm getting 3033 Activesync errors in event logs when users are activesync'ing. I've googled around and got various articles about setting heartbeats, etc. I have to say though; this isn't something i've EVER come across before (i.e. I've never had to much about with heartbeat settings before; my installs usually just 'work' :P ). The error is below. Do I have to add in heartbeat settings into the registry, or is this gonna be related to the PDA mobile carrier/device itself? The firewall is an SP1 from Draytek on a fairly-standard Draytek router.
Event Type: Warning
Event Source: Server ActiveSync
Event Category: None
Event ID: 3033
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.