ZyXEL Communications ZyWALL Troubleshooting Manual page 10

Vpn

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Client-to-Site (RoadWarrior) VPN will not connect

Please use the walkthrough "Dynamic_VPN_Setup_CR.pdf" as an

example to verify the setup on your ZyWALL, to make sure all necessary

settings and rules have been created on the router.

 If the ZyWALL is behind a NAT (another router) make sure the first

NAT is forwarding the VPN ports to the ZyWALL. IKE UDP:500 and

NAT-T UDP:4500

 Make sure your network router is allowing the IPSec ports through

(UDP:500 and UDP:4500) or be sure to enable VPN pass-through if

the router supports this option. Bypass the router if possible to

make sure it is not causing the problem.

 Make sure your ISP is not blocking VPN ports, some providers will

block the VPN ports on their end.

 Verify that your computers firewall is allowing communications

from the VPN client.

 Update your NIC drivers (Ethernet and/or Wi-Fi).

Note:

For updates to your computers NIC cards please visit the computer

manufacturer or the NIC cards chipset manufacturer.

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