SFTP - The key format is not a supported format

Error:

Trying to establish an SFTP connection with key exchange and get this error

com.sshtools.j2ssh.transport.publickey.InvalidSshKeyException: The key format is not a supported format

Cause:

The Key used in the Key Manager activity is not OpenSSH compatible

Solution:

A) Convert the key to OpenSSH

Use OpenSSH tools to convert the key to OpenSSH format. You should then be able to use the converted key with j2ssh.

-https://community.progress.com/s/article/How-to-convert-an-SSH-key-to-other-formats

B) Generate a new key pair using j2ssh or OpenSSH tools

You can also generate a new key pair using OpenSSH tools (ssh-keygen) and then upload the public key to the server

- https://www.ssh.com/academy/ssh/keygen