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Here's how to Change the SSH Port on Dedicated and VPS.

i. Changing the SSH port on a Linux system involves modifying the SSH daemon configuration file. Here are the steps to change the SSH port:

### 1. **Connect to the Server:**
- Connect to your Linux server using SSH with the current port. For example:
```bash
ssh username@your_server_ip
```

### 2. **Edit the SSH Configuration File:**
- Open the SSH daemon configuration file using a text editor. The location of the configuration file may vary, but it is commonly found at `/etc/ssh/sshd_config`. Use a text editor such as `nano` or `vi`. For example:
```bash
sudo nano /etc/ssh/sshd_config
```

### 3. **Locate the Port Configuration:**
- Look for the line that specifies the SSH port. The default is usually:
```conf
Port 22
```
Change the number (22) to your desired port number.

### 4. **Choose a New Port:**
- Choose a new port number between 1024 and 65535. Avoid using well-known ports or ports already assigned to other services.

### 5. **Save and Close the File:**
- Save the changes and close the text editor.

- For `nano`, press `Ctrl + X`, then press `Y` to confirm changes, and finally press `Enter`.
- For `vi`, press `Esc`, then type `:wq` and press `Enter`.

### 6. **Restart the SSH Service:**
- Restart the SSH service to apply the changes:
```bash
sudo service ssh restart
```
or
```bash
sudo systemctl restart ssh
```

### 7. **Verify the New Port:**
- Try to reconnect to the server using the new port:
```bash
ssh -p your_new_port username@your_server_ip
```
Replace `your_new_port` with the chosen port number.

### 8. **Update Firewall Rules:**
- If you have a firewall enabled, update its rules to allow traffic on the new SSH port. For example, if using `ufw`:
```bash
sudo ufw allow your_new_port
```

### Important Considerations:
- Ensure that the chosen port is not blocked by firewalls, and it is allowed by your hosting provider if applicable.
- Always choose a strong, unique port number to enhance security.
- Make sure you update your SSH client configuration if needed, especially if you are using tools like PuTTY.

Changing the SSH port is a security measure, but it's important to keep track of the new port to avoid connectivity issues.