Articles & Guides
Useful resources for web developers and system administrators
Found 61 · Monitoring · Reset
Monitoring
Yandex Metrica and Session Recording: Setup and Privacy
How to set up the Metrica counter and session recording: where the code goes, why recordings and goals fail, the effect on page speed, and the privacy obligations.
Monitoring
High Server Load: How to Find the Cause in 15 Minutes
High server load troubleshooting: find the cause in 15 minutes — CPU, memory, disk, inodes, I/O, network and processes. Real Linux commands and a triage table.
Monitoring
Check Your Website for Errors: What to Test and With What
Check your site for errors by category: broken links (404), server errors (5xx), mixed content, console errors, security headers and markup.
Monitoring
How to Check If a Website Is Down or It Is Just You
Tell whether a site is down for everyone or just you: check from outside, HTTP status, another device and network. What the result means and what to do.
Monitoring
RKN Blocklist 2026: 131,361 Domains Blocked in Russia
Russia's RKN blocklist in numbers: 131,361 domains in the official registry, 1.47M+ in operator lists, 70% outside .ru, 19% of top global sites.
Monitoring
Security Headers Across Russia's Top Sites: a 50-Site Study
Enterno.io scanned 50 of Russia's top sites: only 2% use CSP, 25% use HSTS, and 57% score an F on security headers — while SSL/TLS hygiene is excellent.
Monitoring
Mail Server Monitoring: MX/SMTP/Blacklist
Mail server monitoring: checking MX, SMTP ports 25/465/587, TLS via openssl, blacklist status and alerts. Set up continuous mail monitoring in enterno.io.
Monitoring
Diagnosing Intermittent Downtime
Site goes down intermittently and you can't catch it? How to diagnose flaky outages: continuous monitoring, multi-region checks, a health-check script, and API.
Monitoring
Website Slow to Load: Causes and Fix
Website slow to load? Break it down by phase: DNS, TCP, TTFB, render. Use curl to measure each phase, then a list of causes and fixes to speed your site up.
Monitoring
Website Not Loading: Why It Happens and a 10-Step Fix Checklist
Website not loading? Read the browser error, find the failing layer (device, DNS, TLS or server) and fix it with exact commands for visitors and site owners.