What are the ports used by the Cisco VPN Client?

Hello

I need to open my outgoing traffic on my firewall to allow two interns (LAN) Cisco VPN Client to connect to their Internet virtual private network.

I already opened the port 500/UDP, but they are not able to connect. If I open all outgoing ports, they can connect.

What are the ports used by the Cisco VPN Client?

Thank you

You need to open:

UDP 500

ESP protocol

You must also open the UDP 4500 port (if using NAT - T).

In addition, if the clients are connecting to a VPN 3000 Concentrator series and it is configured for all other options of NAT-transparency, corresponding ports must be open. By default:

1. If using IPSec over TCP 10000, then open TCP 10000.

2. If using IPSec over UDP 10000, open UDP 1000.

Tags: Cisco Security

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