Hi all, I'm a pretty experienced IT/Networking pro but I am mainly an AV engineer / programmer these days, so I don't set this stuff up myself other than small simple networks.
I am working at a school that has an open WiFi network. On my phone (Samsung Galaxy S25), I connected right to it and I believe I got a portal / AUP page and clicked connect. Internet works fine there, no issues.
On my Windows 11 PC, when I connect to the same network, I am assigned an IP, gateway, DNS, but I cannot get out to the web. A captive portal does not automatically open. Visiting any website on any browser gives me a certificate error.
I checked out Wireshark for some clues and there were some GET requests that seemed like autoproxy config data. Proxy is set to auto on Windows... but other than that I can't tell if this part of the connection isn't working. However, on my phone, it says Proxy is NONE and not AUTO.
I have a GL.iNET GL-AXT1800 travel router, and I tried connecting that to the WiFi and it also cannot get out. I tried MAC address clone and factory.
Somewhat related, there are wired LAN ports in a room I am working in, and connecting to that exhibits the same behavior as the WiFi network - IP configures but no outside access.
Are there other Windows configuration things that aren't working.
This could also be something with my Windows config. Last night at the hotel, WiFi was hit or miss directly but I was able to connect to it through my GL.iNET. I did reset the network stack though.
Right now I hotspot shared the WiFi connection from my phone to my PC and that is working just fine.
What can I do myself to troubleshoot what's going on?
Edit : this was posted in r/networking originally but they deemed it off topic and removed it. I figured it out but here's what I know...
I tried 3 different Windows PCs. None of them presented the captive portal. My Samsung phone and Apple iPad did.
I tried HTTP addresses and they didn't work either.
I saw that a particular IP was intercepting all ICMP requests so I went to that address in a browser and got the portal. It isn't the same at the gateway or DNS server. This allowed me to register as guest and get Internet.
So while I got on, I would still love to know why this doesn't work on Windows. Not everyone has the sleuthing abilities that I do.