Check what is valid protocol. If you intend to SFTP, you can use this Data Connector for SFTP. If FTP/FTPS, try connect with FTP Data Connector.
If you’re you are using a firewall, check your accepted IP range/port. Server administrators sometimes change the default port number from TCP/22 for security reasons.
Be sure that your private key has an OpenSSH format format. We don’t support other formats like “PuTTY”.
We do not support the default format of the private key since OpenSSH 7.8. Please re-generate the key using '-m PEM' option.
How do I troubleshoot data import problems?