I've searched around and the only thing I've found is that "yes, OpenVPN supports connections over TCP", but I haven't found any way to coerce the openvpn server to listen the same port for both protocols at the same time. I've found some very old guides about creating tap interfaces, or recommending to have another instance of the server with the same configuration running at the same time. The former looks too complicated for something simple, and the later seems obsolete.
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