Have a strange one here I can’t seem to figure out and hoping someone may know the answer. We have some users who are unable to view our forum when connected on mobile data, with no issues when using a wifi connection. I have validated a users IPv4 and IPv6 addresses and neither are blocked under screened_ip_addresses, and they have no issues accessing another instances of a discourse-based forum or other websites, so I put it down to a setting somewhere in our forum.
I am trying to gather more user data to check this, but in the meantime would anyone have an idea why this could be happening please?
That is a weird one. One thing worth checking is whether the mobile provider is the same for all these users and if it has put your site or IP range on some kind of blacklist. It would explain why several people hit the same issue on mobile data but not on Wi-Fi.
A few other things that can sometimes cause this:
mobile networks often default to IPv6, and if the server or proxy isn’t handling it properly, connections just fail.
if you’re behind Cloudflare (or another CDN/firewall), it might be mistakenly blocking some mobile IP ranges.
SSL/TLS quirks, some carriers still have issues with certain certificates if the chain isn’t perfect.
I’d try to gather from the users which providers they’re on, and whether they’re seeing the problem with IPv4 or IPv6. That should help narrow it down.
Thank you for your suggestions on this. I will reach out to the community and try to gather as much information from them as I can based on your points and see if there’s a pattern here.