Why does portal authentication not automatically pop up the interface?

Why does portal authentication not automatically pop up the interface?  

1. Generally speaking, if the DNS server is reachable, it can be automatically redirected. Check whether the DNS configuration is correct, and let the DNS address in the portal whitelist.

2. Portal authentication page push is initiated by the client first, and the reason the client can automatically pop up is that when the terminal is connected to Wi-Fi, the terminal system will automatically send a page (for example, the Apple terminal will send to several fixed web pages of Apple). Website) sends an HTTP request, then the device configured with portal authentication will intercept it, and then force the portal authentication interface to be pushed out. Some terminals cannot actively pop up the interface because these terminals will not automatically send an HTTP request to a certain page after connecting to Wi-Fi. In this case, the customer needs to manually send an HTTP request in the browser.