Website says I'm behind a VPN and Proxy but I'm not, ISP and site's helpdesk all claim innocence

I don’t know a whole lot about this stuff but I’m not stupid (debatable but not the point).

I’ve been trying to log into underdogfantasy.com on my PC but it keeps telling me I’m behind a proxy or VPN and won’t log me in. It does the same on my phone (via app) when I’m on my home wifi, but on data I’m fine. amibehindaproxy.com says “no proxy detected”, as does amibehindavpn.com. The site’s helpdesk showed me a screenshot of their IP lookup they did on me showing true conditions for both VPN and proxy. Their detected IP matches that of the aforementioned sites. They settled on it being an ISP issue and recommended I use my phone’s hotspot to log in. My data sucks inside my apartment and the site takes forever to load. I don’t want to risk timing out in the middle of a draft.

I called my ISP and predictably they can’t help. They can only troubleshoot internet problems, they said all their ports are open and all they an do is reset my access point. Which I asked them do to. It didn’t help.

I live in an apartment complex that uses Spectrum Community Solutions (free business class internet), so I do not have access to the modem/router aside from flipping the breaker. I’m hardwired with a CAT 6 cable into the wall port.

I have a basic understanding of all this terminology I’m using so anything other than layman’s terms will likely go over my head, but I can follow instructions fairly well.

Specs:

Windows 10 Pro

Firefox 104.0.2

Switching browsers did not solve the problem.

Probably just a false positive from someone else running a VPN who was previously assigned that IP. Unfortunately there’s probably much that can be done.

The most likely explanation is that whatever service Underdog Fantasy is using to identify whether you are using a proxy or VPN is returning a false positive identification for your IP.

At a technical level, there is no easy way to definitively determine whether a given IP is associated with a proxy/VPN service or not, so there is some guesswork involved and there are certainly cases where there may be false positive identifications (report of a proxy/VPN when there is none) and also false negative identifications (report of no proxy/VPN when there actually is one).

Website/app operators typically outsource the job of determining whether an IP is associated with proxy/VPN service to other companies that specialize in this type of stuff (along with IP geolocation etc.)

In order to fix the problem, it could require you to find out what service the website is using to detect IPs associated with proxies/VPNs and then contacting the operators of that service to try to resolve the issue and determine why your IP is being flagged as being associated with a proxy/VPN service.

I just don’t understand how one source detects it and another does not.

Thank you! I am literally going to screenshot this and send it to the helpdesk.

Blacklists for this are often kept secret so they can be sold as a service

I love that you said you’re screen shotting this to send to the help desk despite the guy telling you in his last paragraph how to resolve it, which involves nothing from the help desk.

As someone in tech support, you’re the exact reason we all hate our jobs.

How are they supposed to find oit what the service being used is, without contacting the helpdesk??