| Port No | 500 |
| Service Name | isakmp |
| RFC Doc | 0 |
| Protocol | TCP |
| Description | Used by IPSec to establish connections |
| Reference Link | Port No:500 Service Name:isakmp Protocol:TCP |
| Attack | Firewall 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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