I can confirm I have the same issue in encoding Data to a String, using ASCII encoding. Works as expected on iOS 16, but differently on iOS 17.

@meaton thank you very much for your answer. Do you see this pop-up if you disassociate your NEHotspotConfiguration by removing the configuration? I've tried your suggestion and yes, I'm able to see that pop-up again after I remove the configuration and apply it again on the same Wi-Fi. There is no Developer level API that I am aware of to reset this. Often in this situation like this providing information to the user about the desired workflow helps to avoid any potential mis-steps they may fall into. It would be nice to have at least one setting value on the Network API in order to check this user option. Thanks again.