Event ID - 500

Port No500
Service Nameisakmp
RFC Doc0
ProtocolUDP
DescriptionUsed by IPSec to establish connections
Reference LinkPort No:500 Service Name:isakmp Protocol:UDP
AttackFirewall port 500 inbound and outbound to prevent spurious VPN connections (which allow access through firewalls to internal network components commonly) as well as to reduce potential denial of service attacks.

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