Issue with OpenSSH key pair authentication - works from WinSCP but fails from Azure ADF

[glitchy-netizen]

Hi,

We are testing connectivity to a server running sftpGo from our environment and running into authentication issues.

When connecting to the sftpGo instance from WinSCP using our private key (openssh format) and passphrase the connection works.

When connecting to the sftpGo instance from Azure ADF using our private key (openssh format) and passphrase the connection fails with an authentication failure.

The same key pair from ADF to a different sFTP server works fine. We have our private key in key vault in base64 format as required by ADF but have also tried to make a connection using the PPK file itself from within ADF.

It's odd because we can connect using the same keys but using WinSCP - it seems something might be up with the exchange that happens specifically between ADF and sftpGO.

Are there some specific checks or config options we can ask our partner running the sftpGo instance to make? The only things that come to mind at the moment are to try password auth and also ask them to specifically disable password auth for the user and try key pair auth again.

[drakkan]

Hello,

Thank you for trying to help your business partner. If they are using a supported copy of SFTPGo they can contact us and we will be happy to help them. Otherwise they can ask here as you did. Hope you will be able to understand and fix the issue.