Solution Sheet

When connecting via SFTP for H2H XML format, you may receive the error: "Invalid private key file". This is caused by using a PuTTY-generated key, which is not in the required format for EFTXpress.

Resolution:

1. Generate a new RSA key using rsa-sha2-256 (recommended) or rsa-sha2-512 using the following command:
   ssh-keygen -p -m PEM -f ~/.ssh/id_rsa
2. Submit the new public key to the bank for registration.
3. Replace the old private key in the H2H/SFTP configuration in Setup EFTXpress Banks | SFTP Setup tab and retest.

Note: Do not use PuTTY to generate keys for EFTXpress. For version 2026, the Ed25519 key type is the industry standard.