all Version if IOS.
We´ve tested devices with 9.x, 10.x and 11.x but with your help we could solve it because the problem was only that the captive portal page uses http and not https.
At my last test captive.apple.com was successful before the page was opening because one of my test was a local captive.apple.com website.
After connecting with the Open SSID ios devices checks some urls, for example captive.apple.com - if the request is successful no login page will be loaded, if the request is not successful the login page will be loaded.
Thank you very much for help.
It was a really big problem for use because the most users of this networks are apple users.
I still have one questione more.
On some ios devices (I see it with version 10.x and 11.x) after successful login on the captive portal page the page ist redirected to https://syndication.twitter.com/i/jot .
Greetings