ZyXEL Communications ZyWALL 110 Handbook page 314

Go to CONFIGURATION > VPN > VPN Gateway > WIZ_L2TP_VPN, change
Authentication method to be Certificate and select the certificate which
ZyWALL/USG uses to identify itself to the Android mobile phone.
CONFIGURATION > VPN > VPN Gateway > WIZ_L2TP_VPN > Authentication >
Certificate
Go to CONFIGURATION > VPN > L2TP VPN > Create new Object > User to add User
Name and Password (4-24 characters). Then, set Allowed User to the newly created
object (L2TP_Remote_Users/zyx168 in this example).
CONFIGURATION > VPN > L2TP VPN > Create new Object > User
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