cant get captive portal sign-in page to ope
4th year, same problem, at our winter digs outside USA, think 3rd world. 2 different macs, 2 different iPhones. Turn on wifi and go to network, and MBP and iPhone think that logged in and say wifi on , but w/o captive ISP log in page, with different UN and PW not on line. As in past years I found ways to trick system to open . But now no matter settings, MBP and iPhone automatically say online, when not. Changed all settings in network to force manual sign in. Even erased PW for router and captive in keychain. Doesn't work. Turn wifi on and MBP-iPhone immediately say online. Doesn't happen on neighbors non-apple os systems. At local ISP say never heard of this problem.
MacBook Pro