How to Create a Linux VPS Server on ScalaHosting

ScalaHosting is my recommended VPS provider for running email servers. This article is going to explain how to create a Linux VPS on ScalaHosting. Run an Email Server on ScalaHosting It’s not an easy task to find a VPS provider suitable for email hosting. Many hosting companies like DigitalOcean blocks port 25. DigitalOcean would not…


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How to Create a Linux VPS Server on ScalaHosting

How to Secure Email Server Against Hacking with VPN (CentOS/RHEL)

In this tutorial, I’m going to share with you my tips and tricks to secure CentOS/RHEL email servers against hacking with a self-hosted VPN server. Many spammers are trying to hack into other people’s email servers. If successful, they would use the hacked email server to send large volumes of spam or steal valuable data.…


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How to Secure Email Server Against Hacking with VPN (CentOS/RHEL)

Set Up SSH Two-Factor Authentication (2FA) on CentOS/RHEL Server

This tutorial will show you how to set up SSH two-factor authentication on CentOS/RHEL server using the well-known Google Authenticator. It will greatly improve the security of SSH service on your CentOS/RHEL server. How Two-Factor Authentication Works Usually you only need to enter a password or use SSH key to log in to your remote…


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Set Up SSH Two-Factor Authentication (2FA) on CentOS/RHEL Server

2 Simple Steps to Set Up SSH Public Key Authentication on CentOS

This tutorial explains how to set up SSH public key authentication on a CentOS/RHEL desktop. There’re basically two ways of authenticating user login with OpenSSH server: password authentication and public key authentication. The latter is also known as passwordless SSH login because you don’t need to enter your password. Step 1: Generate SSH Public/Private Key…


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2 Simple Steps to Set Up SSH Public Key Authentication on CentOS

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 a self-hosted VPN server. Many spammers are trying to hack into other people’s email servers. If successful, they would use the hacked email server to send large volumes of spam or steal valuable data. Why…


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How to Secure Email Server Against Hacking with VPN (Debian/Ubuntu)

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 the most well-known open-source web application firewall (WAF), providing comprehensive protection for your web applications (like WordPress, Nextcloud, Ghost etc) against a wide range of Layer 7 (HTTP) attacks, such as SQL injection, cross-site scripting,…


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How to Set Up ModSecurity with Nginx on Debian/Ubuntu

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 the most well-known open-source web application firewall (WAF), providing comprehensive protection for your web applications (like WordPress, Nextcloud, Ghost etc) against a wide range of Layer 7 (HTTP) attacks, such as SQL injection, cross-site scripting,…


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How to Set Up ModSecurity with Apache on Debian/Ubuntu