Practical Guides for Sysadmins: Linux, Windows, Networking & DevOps
Step-by-step tutorials, troubleshooting checklists and plain-English explainers for people who run servers, networks and desktops.
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Popular Troubleshooting Guides
- Fix “wmic is not recognized” on Windows 11
- Nginx 502 Bad Gateway: What It Really Means and How to Fix It
- MySQL/MariaDB Connection Refused: Checklist That Fixes It
- Cron Job Not Running? Checklist Before Blaming cron
- DNS Not Resolving on Linux: Checklist That Actually Works
- Cloudflare 522 on a Coolify VPS: How I Found the Real Cause
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Latest Posts
- When a Full Disk Took Down Our Server — and How Rescue Mode Saved It
Our VPS disk filled up to 100% and the server stopped booting. Here’s how GoDaddy’s Rescue Mode let us mount the original disk, find a 162 GB trash folder, clean it safely and bring the server back. - The “Random” 504 After a PHP Upgrade (and the 5-Worker Trap Behind It)
After a PHP upgrade on cPanel, users started hitting random 504 Gateway Timeouts on an otherwise idle server. The cause was a fresh PHP-FPM pool capped at 5 workers. Here’s how the logs showed it and how we fixed it. - DPDP Rules 2025: 5 Changes to Make on Your Website (Checklist for Indian Site Owners)India’s DPDP Rules reach their second phase on 13 November 2026, and most website duties start on 13 May 2027. Here is a 5-point checklist for site owners: consent banner, blocking pixels until consent, the privacy notice, forms and the key dates.
- Recover Your Old Website Content From the Wayback Machine (Script Included)
List and download the pages of your own old website from the Internet Archive with the CDX API and a short Python script, and decide what is worth publishing again. - WP Super Cache Expert Mode Behind a Reverse Proxy: The X-Forwarded-Proto Rewrite Fix
Expert mode only works if Apache recognises HTTPS. Behind a TLS-terminating proxy it does not, until you change two rewrite conditions. Here is the fix and the other pitfalls. - Block XML-RPC Password Logins in WordPress (and What It Means for Jetpack)
Refuse password logins over xmlrpc.php with a small must-use plugin, remove pingback, and see what the code means for Jetpack and other clients.
Hi, I’m Maruthi Vishnu
I’m a Systems Administrator and DevOps Engineer with 7+ years of hands-on IT experience. Started my career at Revalsys Technologies as a System Administrator — managing Windows Server, Active Directory and enterprise infrastructure. Then deepened my sysadmin expertise at vSplash Techlabs, before moving into DevOps and Cloud at Ratnam Solutions Private LTD where I work with AWS infrastructure today. sysadmin.co.in is where I document everything I learn, break, and build — so you don’t have to figure it out the hard way.
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