# Disabling access to Linux using a password
If you are using SSH keys, disabling access to the server via password will be a useful additional security measure for you.
## Switching off via nano
Use the following command:
```
nano /etc/ssh/sshd_config
```
We get into the **sshd** config.
We find the string **PasswordAuthentication yes**
We need to remove the grid (**#**) so that the row becomes active. And then we change the value of **yes** to **no.**
Press **Ctrl + X**, enter **Y** to save.
Restarting the **SSH** service:
```
sudo service ssh restart
```
## Disconnection via sFTP
In the panel above the file manager, we need to erase the standard path **/root** and specify **/etc/ssh**
In this directory, we need to open the **sshd\_config** file.
We find the corresponding **PasswordAuthentication yes** string.
Remove the grid (**#**) so that the line becomes active. And then we change the value of **yes** to **no**.
We save the file and send it to the server.
## Restarting the SSH service:
```
sudo service ssh restart
```
## Using an SSH key in sFTP
After enabling access only via **SSH key**, a problem may arise when connecting via **sFTP**, which is extremely simple to solve at the moment.
### FileZilla
Click on the Edit category and select Settings
Then select the **sFTP** page and click the Add **Key File** button.
Select the location and add the file.
The key has been added, now **FileZilla** will take it into account when trying to connect to servers.
### WinSCP
Click on the button to create a new connection:
A window opens. Here we specify the **IP address** of the server and the **Username**.
Use the More button under the Password line.
In the window that opens, select the **Authentication** section.
Add the **private key** and click **OK**.
We are trying to connect to the server.
The program requests the secret key code, we enter spacecore:
We have connected to the server!
