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28 Οκτ 2024 · With the advantages of both protocols, it's clear why network documentation calls for both 53/TCP and 53/UDP management when dealing with DNS. Standard queries rely on UDP communication, while zone transfers or more complex queries use TCP.
11 Δεκ 2019 · What dns server are you trying to configure? You can try to disable named service, start and enable you dns server and see if everything go fine. If not, you can enable again named.
18 Απρ 2024 · This sounds like the hotel is intercepting UDP port 53 and trying to MITM it or redirect it to their own (broken) DNS server, probably for logging/blocking purposes. I suggest trying to set up system-wide TLS-based DNS (such as Cloudflare WARP or Tailscale ) to mitigate this.
7 Οκτ 2023 · Eitherway, starting and stopping the firewall on MacOS seemed to clear the fault, and as only DNS services were impacted (to ANY DNS server, not just my local router and DNS servers) it seems much more likely that UDP port 53 was being blocked somehow on the ethernet port.
Look for any errors which says that the DNS server failed to bind on udp/tcp port 53. It could be that there is some other service running on your laptop that is using the same port so you will need to stop that to allow the DNS server to use the port.
Nmap reports port 53 UDP as open/filtered (AKA not responding): Host is up (0.24s latency). Service detection performed. Please report any incorrect results at https://nmap.org/submit/ . A tcpdump analysis further confirms that no responses are received when using UDP.
23 Ιαν 2024 · My Mac as 5/6 processes that run on port 53. I don't think so 🤔 Only a single process can listen on a specific port+protocol. And the dns server should listen on both udp and tcp (for truncated messages not fitting over)
