I would like to ask for help with the configuration of my website.
I recently set up a static HTML website that I proxied using Cloudflare DNS. Everything works fine for a vast majority of my visitors. Unfortunately, one user got in touch and reported that my website fails to load from their Win10 computer, which lives behind a corporate VPN.
They seem to be using a corporate-managed nameserver that produces an accurate non-authoritative DNS record as far as I can tell:
Addresses: 2a06:98c1:3121::3 2a06:98c1:3120::3 126.96.36.199 188.8.131.52
Still, the configuration above produces a CONNECTION_RESET error in their browsers.
Conversely, when I run the same query from my own laptop, where everything works as expected, I get the following records:
Addresses: 2a06:98c1:3120::c 2a06:98c1:3121::c 184.108.40.206 220.127.116.11
From my point of view, all of the above records seem valid (and I would imagine that different clients would be assigned different edge servers based on their location or current load). So, how is it possible that one configuration produces an error while the other loads perfectly fine?
Is it possible that the corporate VPN somehow blocks the subsequent HTTP(S) loading of the website and this is not a DNS problem at all?
I would appreciate any thoughts / suggestions.