My home server VPN is IPv4. The VPN provider I have uses both IPv4/6. Neither of those work.
At this point I am inclined to believe the network carrier is performing DPI as I also can’t use OpenVPN on TCP 80 and TCP 443, which are generally hard to block unless provider is intentionally looking into it…at least that’s my understanding.
Curious as to why is that. Can you please elaborate?