>I used the same setting, and connected with Port 22.
It automatically adds sftp:// to the host when I click the Quickconnect Button.
Removing sftp:// should work just fine with Quick Connect. Anyways, you can always add your ftp account in Site Manager of file zilla and choose FTP Protocol.
Am getting a 503 Login Authentication Failed, and all the login details are correct.
I’ve logged in successfully from your account successfully. Try changing your cpanel account’s password from your member area and then try connecting with the new password.