Johannes Christian wrote:
maybe you can try using telnet to the specific port
e.g $telnet server_ip 53
telnet uses TCP so that won't help for checking UDP.
The reason for opening port 53 is presumably because you have a DNS
server running that you want to be able to access from outside?
If so, just try doing a DNS lookup on one of the zones served by your
server from outside your network:
$ dig @your.server some.hostname
Paul.
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