You got it a little mixed up. If the web port rejects connections there is no way you cand serve a web page to them, they cannot get to the web server.
Th term that you shoud be searching is "port knocking" though I don't know how easy is to do from a mobile phone, it's not exactly a nice user experience. And then you have to decide how long to keep an IP whitelisted and other inconveniences.
In the end there's real reasons everybody relies on web auth.
Th term that you shoud be searching is "port knocking" though I don't know how easy is to do from a mobile phone, it's not exactly a nice user experience. And then you have to decide how long to keep an IP whitelisted and other inconveniences.
In the end there's real reasons everybody relies on web auth.