L2TP over IPSEC not more working on Android 11

Hello Everybody,

Since i change my smartphone, I can't connect on the L2TP over IPSEC vpn anymore. 

My smartphone config:
- Android 11
- Smartphone Oppo Find X3 Pro (ColorOS 11.2)

The VPN Config : Like this guide searchArticle!viewBlob.action (zyxel.com)

The question is : I am alone with this problem :-) ?

Thanks a lot for your help


  • Zyxel_Emily
    Zyxel_Emily Posts: 1,296  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer

    L2TP VPN on our smartphone is able to be established to ATP200 (Firmware: 5.10(ABFW.0)).
    - Android 11
    - Xiaomi Mi A3

    We suggest you follow the wizard on the USG/ZyWALL/ATP/USG FLEX to configure L2TP VPN to avoid mis-configuration.

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