How to Change the Default SSH Port in MacOS Using Terminal


How to Change the Default SSH Port in MacOS Using Terminal

Are you concerned about security and want to enhance it by changing the default SSH port on your MacOS system? Here’s a simple guide to help you accomplish that using Terminal.

Changing the default SSH port adds an extra layer of security to your system by making it harder for potential attackers to identify and exploit your SSH service. By following these steps, you can easily customize the SSH port to better suit your security needs.

Step 1: Open the Terminal

First, open the Terminal on your MacOS system. You can do this by searching for “Terminal” in Spotlight or navigating to Applications > Utilities > Terminal.

Step 2: Edit the Services File

Once the Terminal is open, run the following command to edit the services file:

sudo vim /etc/services

You will be prompted to enter your password. Enter it and press Enter to proceed.

Step 3: Find and Replace the SSH Port

In the services file, locate the lines assigned to port 22, which is the default SSH port. You can use the arrow keys to navigate through the file. Once you’ve found the lines, replace both occurrences of port 22 with your desired SSH port number. Make sure to choose a port number between 1024 and 32767.

Step 4: Restart the SSH Service

After making the changes, you need to restart the SSH service for the changes to take effect. If you have direct access to the console for your MacOS, you can proceed with the following commands in the Terminal:

sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist

These commands will unload and load the SSH service, applying the changes you made to the port configuration.

Step 5: SSH Using the New Port

Now that you’ve changed the SSH port, you can SSH into your MacOS system using the new port number. Use the following command syntax:

ssh <youruser>@<yourHostOrIP> -p <yourNewPort>

For example:

ssh -p 22123

Replace <youruser> with your username, <yourHostOrIP> with the hostname or IP address of your MacOS system, and <yourNewPort> with the port number you chose.

By following these simple steps, you can change the default SSH port on your MacOS system and enhance its security posture. Remember to choose a strong and secure port number, and always keep your system up to date with the latest security patches.