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    You've not shown your entire ruleset. You added the rule in the last place and there could be preceding rules prohibiting incoming traffic. There could be rules prohibiting outgoing traffic. Commented Oct 28, 2024 at 12:00
  • Is the title here a typo? UDP doesn’t have connections. Commented Oct 29, 2024 at 7:36
  • @PhilipCouling: Thank you for pointing that out! You’re correct; UDP is a connectionless protocol, so technically, it doesn’t have “connections” in the traditional sense. I used the term “listening” to mean that the Nginx server is configured to receive packets on UDP port 443 for QUIC traffic, but you’re absolutely right that it’s not a “connection” in the way TCP operates. Thanks for the catch! Commented Oct 29, 2024 at 9:28