Articles & Guides
Useful resources for web developers and system administrators
HTTP
HTTP 504 Gateway Timeout: Causes and Solutions for Sysadmins
HTTP 504 Gateway Timeout — 6 causes, difference from 502, proper timeout tuning in nginx/Apache/PHP-FPM/Node.js with real config examples.
HTTP
HTTP 502 Bad Gateway: What It Means and How to Fix
502 Bad Gateway decoded for nginx/Apache + PHP-FPM/Node.js, how it differs from 500/504, 7 causes, step-by-step fixes with config examples.
HTTP
HTTP 429 Too Many Requests: Rate Limiting Explained
HTTP 429 explained: how rate limiting works, nginx limit_req setup, Redis sliding window, proper Retry-After handling on clients and APIs.
HTTP
HTTP 403 Forbidden Error: 8 Ways to Fix
403 Forbidden causes and fixes: file permissions, .htaccess, nginx, WordPress, ModSecurity, IP blocks. Step-by-step diagnosis through server logs.
HTTP
HTTP 503 Service Unavailable: Causes and Solutions
HTTP 503 Service Unavailable explained: how it differs from 500/502, 6 causes and fixes for nginx, Apache, PHP-FPM, Kubernetes with config examples.
HTTP
HTTP 301 vs 302 Redirect: Differences and When to Use Each
301 vs 302 redirects compared: SEO impact, when to pick each, and setup examples for nginx, Apache, WordPress, PHP. Avoid common redirect mistakes.
HTTP
HTTP 500 Internal Server Error: What It Means and How to Fix
HTTP 500 Internal Server Error decoded: 8 common causes, how to read PHP, nginx, Apache and Node.js logs, and proven fixes for WordPress, Laravel, Express.
HTTP
HTTP 404 Not Found Error: 7 Causes and How to Fix
Learn 7 common causes of HTTP 404 Not Found errors, how to diagnose with DevTools and server logs, and step-by-step fixes for nginx, Apache, WordPress, React.
dns
DNS Records: Complete Guide for Webmasters
Check all DNS record types — A, AAAA, CNAME, MX, TXT, NS, SOA, PTR — with examples, TTL guide, and common configuration mistakes.
ssl
How to Check SSL Certificate and Never Miss Expiration
How to check an SSL certificate: via browser, OpenSSL, and online tools. Certificate types, trust chain explained, and automated expiration monitoring.