#dns

3 articles

October 9, 2026·5 min read

Chrome blocked bad certs after .gh / .sl / .as registry hijacks

On October 6, 2026 Google explained Chrome's response to .gh, .sl, and .as ccTLD registry hijacks: attackers changed DNS and got unauthorized HTTPS certs; Chrome blocked them via CRLSets. Chrome users need no action.

Security

March 9, 2026·6 min read·Tutorial

DNS and email authentication: SPF, DKIM, and DMARC

A practical rollout for authorizing every legitimate sender, signing mail, enforcing DMARC, and catching gaps before messages get rejected.

Email & Collaboration

March 7, 2026·3 min read

Is DNS filtering worth it for SMBs?

When blocking bad domains at the resolver beats buying another appliance—and when it is not enough on its own.

Networking