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Home  /  CAEN  /  Frequently Asked Questions  /  Wireless  /  Linux Cisco VPN Client  /  I installed the Linux VPN client successfully, but I am still unable to connect. Could this be an issue with my firewall?

I installed the Linux VPN client successfully, but I am still unable to connect. Could this be an issue with my firewall?

Yes.  If you have a firewall running on your Linux machine, you should make sure to configure it to allow the following so VPN traffic will pass through:

    • UDP port 500 & 10000 (any port used for IPSec/UDP)
    • TCP port 10000 configured for IPSec/TCP
    • NAT-T port 4500
    • IP protocol 50 (ESP)
    • IP protocol 51 (AH)

 



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Last edited on: 1/1/2008