Unable to create a New SFTP Linked service connection using Public Key Authentication

Question

Hi,

I am currently having an issue setting up a SFTP linked service in ADF using public key authentication and getting the error as
'Invalid Sftp credential provided for 'SshPublickey' Authentication type. DER Length is 114 and cannot be more than 4 bytes'

Attaching the error.

Thanks much,

Answer 1

Hi @Puneet, Mithun ,

Welcome to Microsoft Q&A platform and thank you for using this forum.

SFTP connector supports RSA/DSA OpenSSH key. Could you please make sure your key file content starts with "-----BEGIN [RSA/DSA] PRIVATE KEY-----".

In case if the private key file is a ppk-format file, please use Putty tool to convert from .ppk to OpenSSH format.

Reference MS doc: Use SSH public key authentication (Please see note section in this doc)

Additional info : Please refer to this Stackoverflow thread and see if you can validate whether your passphrase for private key file is correct : C# getting “DER length is '95' and cannot be more than 4 bytes” error while using SSH Ftp

Let us know how it goes.

Thank you