Android Apps Httprequest To Server

I am a recent inmotion user, I had my website working fine and it has a webservices that connects with an android app it was working fine in a shared web hosting but now in a dedicated server I am getting problems with the server response to the app. When I call the webservice from the browsers it works fine, but when I do it from the android app, I get answer null. The only thing that I notice is that from the browser it is a synchronous call but from the app it is an async call, so is there something that needs to be change in the server configuration for this to work? The app works fine pointing to the shared web hosting.

I really appreciate any help, thanks