ft_ssl_private_key

The server’s private key. If it is included in the digital certificate in ft_ssl_identity, then this parameter is not needed.

ft_ssl_private_key = key

This parameter supports private keys in the following formats: PEM, DER, PKCS#12.

You can specify the actual key in this parameter, or you can specify a path to a file that contains the key. See File Names for Certificates and Keys for more information on file types for digital certificates.