SSHConnector is returning Authentication Failed for valid keyfile

Attempting to get a connection to a SFTP server.

Successfully tested the connection details and ppk keyfile via WinSCP

Same configuration and Keyfile fails in SSHConnector node with error “Authentication Failed”

knime.log is showing the error

ERROR : KNIME-Worker-15-SSH Connector 4:92 : : Node : SSH Connector : 4:92 : Execute failed: Authentication failed

java.io.IOException: Authentication failed

…

Caused by: org.apache.sshd.common.SshException: No more authentication methods available

at org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:126)

Does anyone have any ideas on how to resolve this issue?