not that i’m aware off, looks like its an outgoing packet so really your firewall should just allow it.
i just run a slightly modified version of pfsense… and all i had to do was setup the NAT for the storagenode port on UDP and TCP.
i think pfsense default blocks local traffic from going out and blocks all ingoing that not replying to opened connections and then it allows most outgoing online stuff from the network, which software then can use to keep connections open to await reply’s and thus have two way communication, even when “everything is blocked”.
setting up a 100% custom firewall is pretty tricky and pretty much unrequired today, as there are plenty of good easy solutions to use like pfsense.
personally i wouldn’t even try to make my own firewall from scratch, because i think it would be less secure, more difficult to use and cause a ton of problems.
i think you are fine… just enjoy that it’s working now lol