Unfortunately, I think the best answer that can be given is, "It varies."
At one of my clients, I had issues with getting the login screen. I knew the gateway was 1.1.1.1, so I entered that, and I was able to login.
At another client site, I tried the same thing, and it led to nowhere. I sometimes had to disconnect/reconnect to the network upwards of 20 times before I could connect. Very aggravating.
My only recommendation is to clear cache and cookies.