I am using tFTPConnection to connect to SFTP using a public key file. But the issue with this component is that I can't leave Password and Key Passphrase blank as it throws error. But when I tryusing Filezilla, I am able to connect. Please help.
If you mean by blank actually not filling the field, this won't work. But you can provide an empty string "" so that an empty string will be transmitted.
NOTE: I needed to guess this because there is no picture of the configuration at the point of answering.