Cannot connect to backend only in production mode

Is anyone aware of such a case that an Ionic v3 app cannot connect to the backend in production mode, but can in the apk file was build in debug mode. However, this does not occur under Android 6, but only in higher versions.

Are you using HTTPS everywhere? If not, does the problem persist if you change things so you are?

We are using https everywhere. We cant change it on the customer installation, so i cant say if it has an impact.

I don’t understand what this means. If you’re saying “there is a server out there that has data I need, but refuses to get an SSL certificate”, then one thing you could do is to put up a proxy that talks to it and does speak HTTPS.