Captive Portal iOS 16.0.2 issues

hi all,

we have experiences where all apple device can not show up the login page automatically when connected to hotspot. the portal address have to enter manually on browser address. thus on iphone 14-15 the portal page refuse to shown even if the address has been entered manually. no problem on android, windows and linux.

the main router is RB1100AHx4 with ROS v6.49.10

is anyone has clue regarding this problem ?

thank you