Category: Security

How to Block an IP Address on Linux Server

How to Block an IP Address on Linux Server

If you are using Linux server, you may experienced all kinds of attacks from many IP addresses. These attacks can be blocked with firewall. This tutorial will use iptables firewall since it is the most common firewall on servers and it is very simple to do basic operations with it....

Change SSH Listening Port

Change SSH Listening Port

Change SSH Listening Port Secure SHell (SSH) Protocol allows you to securely connect to remote machine over network. Because it’s a very popular and basic tool for managing servers, people who are not authorized to access your server may try to break in. SSH uses port 22 as default port...

Gnome

Change permissions on multiple files

You may found yourself in a situation where you need to change permissions on multiple files or folders on your server because they were messed up for some reason. You can use commands that will go through each file or folder in a specified directory and change their permissions in...

Change SSH Listening Port

Debian 7 Wheezy: Disable SSH Timeout

You may experienced that your SSH connection closed after some time of inactivity. It would display message that connection is closed or simple disable input in Terminal so you can’t type anything. It is normal for a server to close connection on idle time, but there is the way to...

Change number of wait seconds on GRUB Loader

You can change number of seconds to wait in GRUB loader. This is useful for example if you are a new Linux user and you don’t now what is going on that screen. You can change default waiting time to whatever value you want. Default time is 5 seconds. To...

Install Webmin on Debian

(Current version 1.730) Webmin is a software for managing remote server. It has a lot of modules which can be included and it can be used for almost everything. 1. Download Webmin Type this in your terminal to download Webmin from official website:

Squid Proxy

HOWTO: Install Squid Proxy Server

Squid is a caching and forwarding web proxy. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic. This tutorial...

Change SSH Listening Port

SSH Server for Remote Access

SSH or Secure SHell is a protocol for secure remote login. You can set remote host name or you can use your IP address instead for logins. In this tutorial we’ll use OpenSSH command suite. 1. Installation of OpenSSH Install OpenSSH client if not installed (usually it is installed by...