SecuExtender not working with some Clients

RevCos

Dear Support,
We have the case that the Secuextender does not work with some Clients. They can connect and the Status is connected, but they don't get the correct IP address and in General they don't get any IPV4 Settings. The strange Thing is that it does work with other Clients without any Problem. We're just facing Problems with 2 Clients.

Do you have any idea?

Zyxel_Charlie

@RevCos
Regarding to issue of SSL VPN,
if you have registered device, you can download v4.33 firmware from myzyxel.com which already included solution.
The link for download firmware: 
https://portal.myzyxel.com/my/devices
Charlie