Articles & Guides

Website security check: the complete checklist. How to test any website online in 5 minutes — HTTPS, security headers, CSP, cookies, malware — plus a full owner's checklist with curl examples and a layer-by-layer summary table.

Website hacked — what to do in the first hour: a minute-by-minute plan. Isolate the site, rotate all credentials, preserve logs, find the web shell and entry point, restore from a clean backup, and close the vulnerability. With commands, a 10-step checklist, and FAQ.

How to check ping to a server, website, or your internet connection: the ping command on Windows, macOS, and Linux, online ping from another network location, a table of normal ping values, and a diagnostics checklist for high or unstable ping.

Cloudflare blocked in Russia: why sites stall at 16 KB or fail on ECH, how to test from a Russian vantage point, and the DNS and CDN fixes that restore access.

Email not arriving? A step-by-step checklist for senders and recipients: Spam folder, SPF, DKIM, DMARC, MX records, blacklists, bounce codes 550, 552, 554, greylisting. Includes a symptom-cause-fix table, dig commands, and answers to common questions.

How to check a domain's MX record: a DNS check or dig, what the priorities and an empty answer mean, common mail problems and the link to SPF/DKIM/DMARC.

A self-check checklist for a website's 152-FZ compliance: policy, voluntary consent, cookie notice, data storage in Russia, Roskomnadzor notice, HTTPS.

What the "cannot verify the server certificate/identity" error means and how to fix it: name mismatch, expiry, self-signed, incomplete chain, revocation.

How to read a CSP console error and fix it correctly: the script-src/connect-src directives, nonce and hash instead of unsafe-inline, and Report-Only mode.

Two ways to connect a domain to hosting: change the NS servers or add an A record. Step by step, how long DNS takes to update, and how to confirm it worked.