Ubuntu
- Web Server Errors
Fix PM2 Showing “Online” But Nothing Is Listening
A production Node.js application suddenly started returning 502 Bad Gateway errors while PM2 continued showing the services as “online.” Here’s…
Read More » - Web Server Errors
Fix MariaDB “Error writing file .frm” During Import
Getting Error writing file '.frm' while importing a MySQL database into MariaDB? The problem may not be disk space or…
Read More » - Email SMTP Issues
Fix SpamAssassin “URIBL_BLOCKED / Spamhaus Blocked Due to Open Resolver”
SpamAssassin still showing URIBL_BLOCKED_OPENDNS even after installing Unbound? The issue is usually DNS leakage via systemd-resolved. Here’s the correct, production-safe…
Read More » - SSL DNS Problems
Fix BIND9 Open Resolver Issue on Virtualmin Server
BIND9 was unintentionally acting as a public recursive DNS resolver, creating a security risk. This guide shows how to safely…
Read More » - Email SMTP Issues
Fix Receiving Spoofed Emails from Your Own Domain
If your VPS is receiving fake emails that appear to be sent from your own domain, your DMARC enforcement is…
Read More » - Email SMTP Issues
Fix OpenDMARC Service Failed
OpenDMARC failing to start with an “unrecognized parameter” error is usually caused by unsupported config directives. Here’s how to fix…
Read More » - VPS Setup
How to Safely Use the Root User on a VPS
The root user has full control over your server, which makes it powerful and dangerous at the same time. This…
Read More » - VPS Setup
Essential Linux Commands for VPS Beginners
If you are new to VPS hosting, the command line can feel intimidating. This guide covers the essential Linux commands…
Read More » - Performance & Optimization
How to Check MySQL Bottlenecks on Ubuntu (Slow Query Guide)
A slow MySQL server can bring down the performance of your entire website, especially if you’re running WordPress or WooCommerce…
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