The Secure Shell (ssh) protocol by default uses the port 22. Attackers mostly uses the port 22 in automated attack and changing the default will prevent your server from these automated attack. There are many ways of making your server secure and changing the default ssh port is one of the server hardening. Steps to…
Normally when we try to unmount a partition or a disk (Cd-rom or any other partitions) in Linux, sometimes we get an error umount: /xxx: device is busy. This is because other resources of the machine are still accessing the drive. You can use the fuser command to kill forcefully mounted partition or you can…
SMTP uses port 25 as its default port. When you configure mail server on your server, port 25 is use to send mails. Sometimes ISP blocked the 25 port for junk mail protection as a result you are unable to send mails from your server. Most the ISP suggests to change the Default SMTP port…
Search is the most important factor which we often used in our daily routine. Some time we need to search multiple words or string in a file, and grep provides the functionality to look into a file and search more than one words. With the combination of grep command and regular expression we can search…
Creating sub domain in cpanel is quite simple. To create sub domain in cPanel follow the bellow steps: 1. Login your cpanel account. 2. Click on Subdomain Icon under the Domains section. 3. Fill the subdomain you want to create in the subdomain field. Your complete address should be “subdomain.example.com” 4. Select the main domain…