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Update your computers NIC drivers.
Note: For updates to your computers NIC cards please visit the computer
manufacturer or the NIC cards chipset manufacturer.
Bypass your router (if possible) to make sure it is not blocking the
attempt to connect/establish the L2TP VPN.
Check the ZyWALL’s IKE logs to make sure it is receiving a request
to establish the VPN. By default the ZyWALL is programmed to
allow VPN traffic, if the IKE logs on the ZyWALL do not show any
IKE connection attempts try disabling the ZyWALL’s Firewall/Policy
Control. If still no luck, check with your ISP to make sure they are
not blocking ports on the service end.
To disable the ZyWALL’s firewall/policy control, go to:
Configuration Firewall OR Configuration Security
Policy Policy Control
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