Steps to Check the Version of SSH on Linux

SSH version checking steps in Linux

Secure Shell (SSH) is a network protocol used to securely establish remote connections on the network. connect. In Linux systems, SSH plays a very important role as it is the standard way of managing and maintaining remote servers. In order to ensure the security of the server, we need to know the version of SSH running on the server. The following will introduce in detail the specific steps to check the SSH version in a Linux system, and provide corresponding code examples.

Step 1: Log in to the server

First, you need to log in to the target server through the SSH protocol. Enter the following command in the terminal:

ssh username@server_ip

where username is the user name of the server, and server_ip is the IP address of the server. After entering your password, you will successfully log in to the server.

Step 2: Check the SSH version

Next, you can use the following command to check the SSH version running on the server:

ssh -V

or

ssh -V

This will output the SSH version information installed on the server, including the OpenSSH version number, copyright information, etc.

Step 3: Check the OpenSSL version

The SSH protocol uses the OpenSSL library for encryption and decryption operations. Therefore, we can also check the OpenSSL version installed on the server through the following command:

openssl version

This command will display the OpenSSL version information used by the server.

Step 4: Check the OpenSSH configuration file

To view the SSH configuration file and determine the SSH version on the server, enter the following command in the terminal:

cat /etc/ssh/sshd_config

Look for the line in the output that contains the Protocol keyword, which will display the SSH protocol version used on the server.

Step 5: Check the SSH service status

Finally, you can check the running status of the SSH service through the following command:

systemctl status sshd

This command will display SSH The current status of the service, including whether it is running and any error messages.

With the above steps, you can easily check the SSH version running on your Linux server. This information is important to ensure server security and address potential security vulnerabilities. Regularly checking your SSH version is a crucial step when managing and maintaining your server.

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