Captive Portal page does not display when all traffic is routed through an IPSec

[swalz]

I have a setup where I have a LAN1 and LAN2 interface.
Both LAN interfaces are routed through an IPSec tunnel.
The Captive Portal page does not display when it is linked to the LAN2 interface and only works on LAN1?
Has anyone had this problem before?
I believe it is because when the IPSec tunnel is enabled you cannot ping or reach your LAN interface any more as all traffic is routed through the IPSec tunnel.
But how to fix?

Thanks