Hello,
when my router is offline (no internet connection) - I don't get the login.html page on my samsung S8 (andorid 7)
when I connect with my LG (android 6 and android 6.0.1) - I get the login.html
also when I connect with windows7
and android 5
what could be the problem?

how can I fix this for android 7 ?

(I need my users to know if there is a problem with the internet)

Thanks ,