Solution by Event Log Doctor

This error is somewhat critical and will probably prevent any mobile device that uses ActiveSync from receiving push notifications (see also event 3015 from same source).

The installation of patch 951746 and/or 951748 causes this problem as soon as you reboot, a result of enhanced security for DNS.

To resolve this problem, see the additional links below - or - as a quick fix - navigate to this registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

and edit the "ReservedPorts" value by ADDING the following lines:

645-1646
1701-1701
1812-1813
2883-2883
4500-4500

This change requires a reboot, and the fix resolved our problems immediately after the reboot.

Fortunately, EventSentry emailed me about the event right away so troubleshooting this was a bit easier.

Solution by Jim Horst

Rceiving hundreds of these errors. May be related to a recent srvice pack of Retrospect.