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Event ID: 4284 Source: IPSec

Received n packet(s) in the clear from IP address which should have been secured. This could be a temporary glitch; if it persists please stop and restart the IPSec Policy Agent service on this machine.
As per Microsoft: "The IP Security (IPSec) driver is receiving broadcast packets from the TCP/IP driver. IPSec is only for unicast traffic and should not be receiving broadcast traffic. The broadcast traffic is not encrypted and causes the IPSec driver to log an event about the packet being in the clear instead of being secured.". Windows 2000 SP1 was supposed to resolve issue but we have received reports that even with Service Pack 3 the problems still persists. See ME259591 for more details.

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