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Best bet is probably going to be using something like OpenVPN on port 443 in TCP mode, which basically looks like regular HTTPS. It's a hotel, I doubt they're going to be doing deep analysis to detect signs it's OpenVPN. It's detectable easily but they wouldn't spend the money on that advanced of a firewall.
My guess is they went for an allowed list of ports rather than blocked, so it lets DNS (53), HTTP (80), HTTPS (443), probably also POP/IMAP/SMTP (110, 995, 143, 993, 465)
Yeah this actually works, but only specifically for openvpn on 443 in TCP mode...anything wireguard is blocked regardless of port.
Yep there's a reason I reached directly for that configuration. WireGuard uses UDP, that's one of the first things that gets blocked.
Turns out that's also the kind of protocol corporate VPNs use, reusing port 443 over TCP. They call those "SSL VPN". They get to weed out all commercial VPNs used to bypass their firewalls as well as most torrent/game activity while still mostly catering to their business guests.