After updating from iOS 14.2 to 14.3 the app does not respond.
Welcome as ERPNext user!
Please try to reinstall the app.
Please try to reach the server trough web browser on your local IP address.
One of it should work.
As I see you are on a shared Wifi may be it cause the problem.
Hope it helps.
I’ve also tried it on non shared wifi. I have a device with 12.3 and it works fine.