- 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 » - Web Server Setup
How to Install Virtualmin + Nginx on Ubuntu 24.04
This guide shows how to install Virtualmin with Nginx on Ubuntu 24.04 using a clean LEMP setup. By preparing the…
Read More » - VPS Basics & Preparation
Ubuntu Initial Server Security (Updates, Firewall, SSH Basics)
Secure your Ubuntu 24.04 VPS with essential hardening steps including firewall, SSH protection, and Fail2Ban.
Read More » - Application Installation
How to Install Marzban on Ubuntu 22.04 VPS
A clean, step-by-step guide to install Marzban on Ubuntu 22.04 with Docker, Nginx, SSL, VLESS, and VMess — without the…
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