Server ActiveSync on exchange 2003 sp2 problem

hello:
i have recive this error :

Event Type:      Warning
Event Source:      Server ActiveSync
Event Category:      None
Event ID:      3017
Date:            12/05/2009
Time:            09:37:47 5
User:            N/A
Computer:      MAIL-SRV
Description:
IP-based AUTD has detected that the registry value for the maximum heartbeat interval is set to a value greater than the maximum allowable value of [3540] seconds.  As a result, we will proceed with the default maximum heartbeat interval of [2700] seconds and the default minimum heartbeat interval value of [60] seconds.  To avoid seeing this message in the future, please correct this registry value, or omit it entirely in order to use the default.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

thanks.