Gateway Enable LAN But I am not able to access using LAN

Hi,

I am using RAK7289CV2 gateways when I select WLAN and set Ethernet IP fix 199.199.51.124 and I am successfully access the web page of gateway but When I enable the LAN and Disable the WLAN after this I am not able o access the gateway using LAN and also Wifi. so How I can access the gateway in LAn or Wifi.