Sorry but this article is kinda bad.
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Openconnect VPN... sorry do i have to say more. This has to be a joke, this solution doesn't even come close to openvpn or wireguard in feature set, performance and whatever metric you want to look at.
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OpenVPN comes before Wireguard. This makes no sense wireguard is faster and easier to setup. Literally no reason in 2023 to even consider openvpn, unless one of your clients is a windows 2000 machine.