Network.request: isError -1 on some wifi network

Hi Guys!

I’m getting this error isError = -1 for my network.requests on a specific wifi network of my client’s house. This error does not happen when i’m outside using 3G,4G network or even at my own home’s wifi network. It only arises at my client’s wifi network.

The error is immediate on both iOS & Android when i does a network.request so i’m quite sure its not because of timeout or network latency. Also other apps seems to work fine on the wifi network. Does anyone know what could be the cause and how to resolve this? 

I hoping its just my client wifi network that have the problem but i cant deny the fact when the app is launch, this error may pop up in different user’s phone so would need to resolve this. Any advice is appreciated. Thanks so much!