This is a long shot, but it looks like you are trying to connect to a non-ssl web service.
From what I remember, later versions of Android only allow connections to secure (https) websites by default and you need to add a line into the manifest to allow your app to make connections to http (non-ssl) website.
Maybe the Galaxy A9 is using a later version of android that has this restriction and the other copies of your app that are working are using an older version of android that does not have this restriction.
But I just spent 5 minutes searching and I can find the forum post that discusses this - so maybe I'm imagining this