Problem with iOS app

Hello to all,
i’ve tried to use the iOS app of VM401 on 4 different ios device, but in all devices now appears only the message Login Failed.
BUT i can’t configure in any mode the app to go to my IP configuration, seems to be an ip coded on the app.

In the past i can insert my ip at the first launch off the app but not now…

I think it’s really important that i can configure the ip without reinstalling the app… as the example only using a separate menù.
Thanks for the answer.