SFTP Deployment Failing

Collin Newberry's Avatar

Collin Newberry

03 Apr, 2024 03:27 PM

We are using the ftp deployment provider but getting errors authenticating to the remote server. I can access the build worker via ssh and run the sftp deployment manually from the build worker using the same credentials with no problems. Our deploy configuration is below. The error we are seeing on the server appears to be "no matching host key type found. Their offer: ssh-rsa,ssh-dss [preauth]"
The server is running Ubuntu 22.04 with software versions OpenSSH_8.9p1 Ubuntu-3ubuntu0.6, OpenSSL 3.0.2 15 Mar 2022
We have tested with both ubuntu-2004 and ubuntu-2204 build worker images
    provider: FTP
    protocol: sftp
    host: redacted
    username: redacted
      secure: redacted
    folder: redacted

  1. Support Staff 1 Posted by Feodor Fitsner on 04 Apr, 2024 03:56 AM

    Feodor Fitsner's Avatar

    Hi Collin,

    It could be the SFTP library used by AppVeyor build agent (SSH.NET) does not support enabled host key types or, perhaps, requires an update. Take a look at its readme to see if key type amongst supported types: https://github.com/sshnet/SSH.NET

    If so, you may try writing a simple console app trying to connect to your SFTP server using the latest SSH.NET version.

    Alternatively, you can just use sftp Linux command as the build runs on Linux, or WinSCP if you deploy from Windows.

  2. 2 Posted by Collin Newberry on 05 Apr, 2024 01:26 PM

    Collin Newberry's Avatar

    Thank you Feodor, I checked the docs and it looks like there is overlap between the current version of SSH.NET and the OpenSSH server we are running. I will look into using a simple bash script to do the deployment.

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