Change your private key formant from OPENSSL (--BEGIN OPENSSH PRIVATE KEY--) to PEM (--BEGIN RSA PRIVATE KEY--)
$ ssh-keygen -p -m pem -f my_private_file
Change your private key formant from OPENSSL (--BEGIN OPENSSH PRIVATE KEY--) to PEM (--BEGIN RSA PRIVATE KEY--)
$ ssh-keygen -p -m pem -f my_private_file