How to disable ICMP and ICMPv6 redirects in Linux
In this tutorial we will learn how to disable ICMP and ICMPv6 redirects on the Linux server. ICMP redirects are used on routers so if your Linux server is not acting as a router then ...
Security
This covers topics and articles related to Security of Linux server such as patch management, vulnerability assessment, security hotfix.
How to setup http/https proxy with special characters in password
In this tutorial I will share the steps to setup http_proxy or https_proxy when your username or password contains special characters such as comma, @, # etc. Error: Unable to set http_proxy or https_proxy ...
Read MoreHow to setup http/https proxy with special characters in password
How to disable SELinux (with and without reboot)
In this tutorial I will share you the steps to disable SELinux properly in Linux environment although it is not recommended instead you can choose to change active mode to Permissive. We will cover this ...
Beginners guide to use ssh config file with examples
Did you recently heard for ssh config file for the first time? Now wondering is there really is a ssh config file or I heard it by mistake? As you only knew about sshd_config? Let ...
Read MoreBeginners guide to use ssh config file with examples
How to disable ICMP timestamp responses in Linux
In production environment, security is one of the most important factor due to which we perform regular security scans and perform regular patch management to fix security vulnerabilities. One such vulnerability is related to ICMP ...
Linux sftp restrict user to specific directory | setup sftp chroot jail
In this article I will share step by step guide on how to configure sftp server in Linux with examples covering the below topics in detail: Install sftp on Linux Configure sftp chroot Create sftp ...
Read MoreLinux sftp restrict user to specific directory | setup sftp chroot jail
6 easy steps to setup offline two factor authentication in Linux
In this article I will share Step-by-Step Guide to Install and Configure Offline Two Factor Authentication using Open Source Google Authenticator for below scenarios in Linux Configure offline two factor authentication for SSH Configure offline ...
Read More6 easy steps to setup offline two factor authentication in Linux
Easy steps to open a port in Linux RHEL/CentOS 7/8
Check port status To check the list of existing ports which are open we will use nmap to check port status: [root@centos-8 ~]# nmap localhost Starting Nmap 7.70 ( https://nmap.org ) at 2020-03-22 12:08 ...
6 ssh authentication methods to secure connection (sshd_config)
The SSH protocol (aka Secure Shell) is used to establish secure and reliable communications between two hosts. It supports different ssh authentication methods and uses strong encryption to protect exchanged data. It is possible to ...
Read More6 ssh authentication methods to secure connection (sshd_config)
How to change LUKS device master key, cipher, hash, key-size in Linux
In this article I will share the steps to change LUKS device master key, cipher, hash and key-size. Now due to security reasons you may get a requirement to change LUKS device master key or ...
Read MoreHow to change LUKS device master key, cipher, hash, key-size in Linux