How to Fix Common Let’s Encrypt/Certbot Errors
If you are a Linux server administrator, you probably know that Let’s Encrypt is a free, automated, and open certificate…
🔥 Automatic IP and Domain Warm-up For Your Email Server
This tutorial is going to show you how to warm up your email server IP address and domain name automatically,…
How to Use Apache JMeter to Load Test Web Applications
Apache JMeter is an open-source load testing tool, available for Linux, macOS, and Windows. In a previous tutorial, we explained…
Linux Server Performance Monitoring with Netdata (2022)
Netdata is an open-source real-time Linux server performance monitoring tool with a beautiful web front-end. It allows you to monitor…
How to Fix Common Nginx Web Server Errors
Nginx is a very popular web server these days. This article will show you some common errors when running an…
Use Port Knocking To Secure SSH Service (Debian/Ubuntu)
In this tutorial, I’m going to show you how to use port knocking to secure SSH service on Debian and…
10 Steps in Application Security Assessment
If you are a web-based company or even a company that uses the internet for any purpose, application security assessment…
WireGuard Mesh VPN Encryption for MariaDB Galera Cluster
This tutorial is going to show you how to build a WireGuard mesh VPN and use it to encrypt replication…
How to Set Up Authoritative DNS Servers with Webmin
In previous tutorials, we explained how to set up authoritative DNS servers and edit DNS records from the command line.…
How to Create a Linux VPS Server on ScalaHosting
ScalaHosting is my recommended VPS (Virtual Private Server) provider for running email servers. This article is going to explain how…
How to Secure Email Server Against Hacking with VPN (Debian/Ubuntu)
In this tutorial, I’m going to share with you my tips and tricks to secure email servers against hacking with…
How to Set Up ModSecurity with Nginx on Debian/Ubuntu
This tutorial is going to show you how to install and use ModSecurity with Nginx on Debian/Ubuntu servers. ModSecurity is…
How to Set Up ModSecurity with Apache on Debian/Ubuntu
This tutorial is going to show you how to install and use ModSecurity with Apache on Debian/Ubuntu servers. ModSecurity is…
How to Configure User Quota in Dovecot & PostfixAdmin
This tutorial is going to show you how to configure user quota in Dovecot and PostfixAdmin. Prerequisites To follow this…
Run OpenConnect VPN Server & Apache/Nginx on the Same Box with HAProxy
This tutorial will be showing you how to run OpenConnect VPN server (ocserv) and Apache/Nginx on the same box with…
How to Install Proxmox Virtual Environment on a Dedicated Server
This tutorial is going to show you how to install Proxmox VE on a dedicated server. Proxmox VE (Virtual Environment)…
Set Up SMTP & IMAP Proxy with HAProxy (Debian, Ubuntu, CentOS)
In previous tutorials, we discussed how to set up a mail server from scratch on Linux (Ubuntu version, CentOS/Rocky Linux/RHEL…
Enable and Configure Postscreen in Postfix to Block Spambots
In previous tutorials, we discussed how to set up a mail server from scratch on Linux (Ubuntu version, CentOS/RHEL version).…
Use Postfix Transport Map & Relayhost Map For Flexible Email Delivery
In previous tutorials, we discussed how to quickly set up a full-featured mail server using iRedMail or Modoboa, and we…
Run Apache, Nginx & HAProxy on Same Server (Debian, Ubuntu, CentOS)
If you’re a server admin, you probably have a web server of your choice like Apache, or Nginx. Apache is…
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