Hardening SSH (Secure Shell) on your Debian / Ubuntu server is something that should be done immediately. It is not hard to do and can save you from lots of potential brute force attacks. Change the Default SSH Port Changing the default SSH port is one of the easiest...
Changing SSH Default Port The default port for SSH is port 22. This can easily be changed by modifying the /etc/ssh/sshd_config file. vi /etc/ssh/sshd_config Change the section that says “Port 22” to your new chosen port number. The new port number does...
You can easily configure fail2ban to monitor failed login attempts for you ISPConfig 3 control panel installation. In this article, I assume you already have a working ISPConfig 3 installation with fail2ban installed. Example: The Perfect Server – Debian 8...
There are a few different ways to block an IP address in Debian / Ubuntu. This article describes one way to block an IP address using the null routing reject command. Temporally Block An IP Address Use the following command to temporally block an IP address. To...