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2026-10-19
Let’s Encrypt — a free certificate authority that issues DV certificates automatically, without applications or payment. Issuance and renewal are done via the ACME protocol (Automatic Certificate Management …
Read more2026-10-07
ECH (Encrypted Client Hello) — a TLS 1.3 extension that encrypts the first handshake message, ClientHello. The main thing it hides is the site name in the SNI field. Without ECH any node between you and the server can …
Read more2026-09-22
DNS (Domain Name System) — a distributed system that tells, by domain name, where a website is located, where to deliver mail, and who owns the domain. Each such response is stored in the domain zone as a record of a …
Read more2026-09-22
It happens: the computer has an address, the router responds, ping 8.8.8.8 works, but websites in the browser do not open. Most often the cause is DNS — the system that translates domain names into IP addresses. If a …
Read more2026-09-22
Pi-hole is a DNS server with filtering that blocks ads and trackers for all devices on the network at once: computers, phones, TVs, and smart devices where you can’t install a browser extension. Pi-hole is …
Read more2026-09-22
BIMI (Brand Indicators for Message Identification) — a standard that allows a mail service to show a company’s logo next to its messages. The logo is tied to the domain via a DNS record, and the right to it is …
Read more2026-09-21
3proxy — a free open-source proxy server that combines HTTP proxy, SOCKS proxy, mail and FTP proxies, port forwarding and a caching DNS in a single small program. The author is Vladimir Dubrovin, known by the nickname …
Read more2026-09-21
Where to configure DNS records DNS records are edited in the control panel of the service that manages the domain’s DNS. Most often this is the registrar where the domain is registered, but DNS can also be …
Read more2026-09-21
In addition to A and MX records for mail, three other records are important: SPF, DKIM and DMARC. They confirm that messages are actually sent on behalf of your domain, protect against sender address spoofing, and help …
Read more2026-09-21
The website, email, and other services on a domain are connected by DNS (Domain Name System) — the system of domain names. When a visitor types example.ru into a browser, DNS servers tell the browser the IP address of …
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