Tag: dns

Six addresses on 194.242.2.x stop answering on 2 November 2026. Quad9 replaces the resolver, but not the ad blocking that five of those six endpoints did.

Somebody on the network team pulls a capture off the guest wifi, filters for TLS, and half the hostnames are gone. The Android half. That is Android 17 doing what ...

So you switched DMARC on, and now google.com mails you a little .xml.gz file every morning. You open one, meet a wall of nested tags, and quietly close it again. ...

You push a DNS change, then sit there wondering if it actually took. Don't wonder, ask: nslookup example.com works on any OS, Windows included, and confirms a name resolves or ...

The new server is up, the IP is sitting in your clipboard, and the OVH panel is doing its best to hide the one tab you need. It's the DNS ...

You fixed the DNS record, and your Linux box keeps serving the old IP anyway. On modern Ubuntu, Debian and Fedora the fix is sudo resolvectl flush-caches, because systemd-resolved is ...

A site moved servers yesterday and your PC keeps loading the old one. That's the Windows DNS cache holding a stale answer, and one command clears it: open Command Prompt ...

Your invoice email just landed in spam, and the content wasn't the problem. The DNS was. SPF, DKIM and DMARC are the three records that decide whether mail from your ...

You changed the record an hour ago, and half the office still lands on the old server. That's DNS TTL: the number of seconds a resolver may cache a DNS ...