Samsung Galaxy J5 connected to WiFi but network not available

I bought this brand new Samsung Galaxy J5 yesterday, but I'm stuck with an internet connection problem. The thing is that the WiFi connection worked properly on the store and at some other places, but in my home, it connects to the WiFi but I don't seem to have any network (I open the browser but can't access any URL). All others devices that I have in my house work very well (other Android devices). I'm assuming then that : 1) The J5 is working properly (as I can connect it at other places); 2) The WiFi in my home is working properly (as others devices connect to it *and* can access any URL). I was digging many hours yesterday on the web to find a solution for this but nothing has worked so far. By the way, all "J's" devices seem to have a lot of these issues. Is it correct to say that I may be facing some kind of compatibility issue, between J5 and my WiFi? If yes, what could I do to solve it?