[pfranz]

I've never seen a setting for it. It's just a modal dialog with a webview. Like iOS, you have "Cancel" as an option until it connects and changes to "Done."

Here's a screen shot I found: https://www.wireless.bris.ac.uk/gfx/eduroam-osx/captive_port...

[gumby]

Drat, I've never seen that on OS X. Just on iOS.

Because of this thread I simulated it on my network and couldn't cause it to show up.