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Why can't I build the L2TP tunnel after installing the Zywall VPN client?
Wherever I try to build L2TP tunnel, an error message pops-up immediately after clicking "connect".
When running Zywall IPSec VPN client it will stop the Windows service "IKE and AuthIP IPsec Keying Modules". In most of cases it does not have problem since this service is triggered by event which means it can auto activate when using L2TP over IPsec.
In rare cases, the service is stopped and leads to the issue that fails to build the L2TP tunnel, If you find one day that the L2TP tunnel fail but has worked before, then can check Windows services.
Use Windows shortcut keys:
1. Win + R to launch Run.
2. Type services.msc into the dialog box.
3. Press the Enter and open the Windows Services.
Then check the services name "IKE and AuthIP IPsec Keying Modules". If status is blank, then this means that service has stopped, will need to be activated.
Still have trouble with your device? Contact Zyxel technology support team directly!Contact Zyxel Support