Checks for open/closed ssh ports using nmap command

In this tutorial, How to checks all ports if they are closed or open and if the current ssh version? Using nmap command. Read man nmap page.

The first, you have install nmap.

For ubuntu
$ sudo apt-get install nmap

For centos
$ sudo yum install nmap

For example, checks for open/closed ports and current ssh version
[huupv@huupv]$ sudo nmap -sV -p22 --version-all  localhost

The output Checks for open/closed ssh ports using nmap command as below


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