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dig @8.8.8.8 mydomain.ddns.netgive you, or try some online resolver like nslookup.io . If these also give you NXDOMAIN, it means ddns did not really update the record. you write "everything seems fine", but can you post e.g. a screenshot of my.noip.com/dynamic-dns with your entry? Does it say "Active" under the entry?(1 server found) global options: +cmd Got answer: ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 48655 flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 OPT PSEUDOSECTION: EDNS: version: 0, flags:; udp: 1232 COOKIE: f4d61592bacb5e1f010000006401e94ef8b8411a85020221 (good)