To make sure that you are connecting to the right server, you can select an authentication method, if you have chosen SFTP as connection type.
From the Tools menu, select Site Manager to open the Site Manager dialog box.
As connection type select SFTP, and click the Advanced button to open the Authentication Method dialog box.
You can now select either a password, a public or private key.
If you like to define both, check option Both.
Enter a password in the Passphrase field, and / or browse for the private key file.
Click OK to close the dialog box.