Event ID - 500

Port No500
Service NameUDP IKE Nb isakmp DoS
RFC Doc0
ProtocolUDP
DescriptionThis signature detects an attempt to perform a Denial of Service attack against a host running Windows 2000.
Reference LinkPort Number:500 Service Name:UDP IKE Nb isakmp DoS Port:UDP
AttackAccording to Symantec

Resolution:
This issue is addressed by Windows 2000 Service Pack 3 (SP3)

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