LOLLIPOP PHONES DON'T WORK ON MIKROTIK x86 v6.30

hi guys i have problem with lollipop phone they connect to the server but without internet and they don’t open sign in page for hotspot pleaz help my clintes start to be mad
forgive my english it’s not that good

many questions need to be answered:

  1. you have wireless probably. in this x86 or a separate AP?
  2. only lollipop devices? iphone, android with older OS, all work fine?
  3. if they open some webpage in the phone, what happens?
  4. in the router, do you see any LOG about this connection?

1.separates APs
2.yes only lollipop phones
3.This webpage is not available
4.no there is no LOG about thes
thankes