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ZyWALL (ZLD) VPN Troubleshooting
No traffic flow through L2TP VPN tunnel
Client-to-Site (RoadWarrior) VPN will not connect
No traffic flow through client-to-site IPSec VPN tunnel (RoadWarrior)
Site-to-Site VPN will not establish
No traffic flow through site-to-site IPSec VPN tunnel
SSL VPN connection will not establish
Connection issues with SSL VPN
L2TP VPN will not connect
Please verify your VPN rule setup with the example provided on the
“ZyWALL_L2TP_VPN_Setup.pdf” walkthrough. If your setup is similar to
the example provided please check the following:
Is the ZyWALL behind a NAT (another router)? The L2TP function
will not work if the ZyWALL is behind another router. This is a
limitation on the devices L2TP capability, the ZyWALL needs direct
communication with the public network (internet).
If the L2TP client is behind a router please make sure that VPN
pass-through is enabled or create port forwarding rules so it does
not block the L2TP communication to the ZyWALL.
