"No supported authentication methods available" while connecting to SFTP using WinSCP in C#

Question

I'm trying to connect to a SFTP server using WinSCP in C#. This is my code:

SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = "ip",
    PortNumber = portNR,
    UserName = "username",
    Password = "",
    SshHostKeyFingerprint = "fingerPrint", 
    SshPrivateKeyPath = "\\PrivateKey\\PrivateKey.ppk ",
};

using (Session session = new Session())
{
    session.Open(sessionOptions);
}

But when I run the application and it reaches this like

session.Open(sessionOptions);

I get this Error:

Disconnected: No supported authentication methods available (server sent: publickey,gssapi-with-mic)

Does your key is password-protected? – Nickolay Olshevsky Dec 21 '12 at 09:45 — Nickolay Olshevsky, Dec 21 '12 at 09:45
yeah it is. where do i set the password for the ppk file ? – Lahib Dec 21 '12 at 09:52 — Lahib, Dec 21 '12 at 09:52
See http://winscp.net/eng/docs/faq_passphrase – Martin Prikryl Jun 17 '14 at 14:42 — Martin Prikryl, Jun 17 '14 at 14:42

score 3 · Accepted Answer · answered Dec 21 '12 at 10:06

3

You should use private key without password or pageant, since WinSCP C# classes don't support setting password for private key.

answered Dec 21 '12 at 10:06

Nickolay Olshevsky

12,356
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do you have ny idea what else i can use, that allows me to set the password of a ppk file ? – Lahib Dec 21 '12 at 10:10
2

There is free/opensource C# BouncyCastle library, they should support SFTP. Also there is commercial SecureBlackbox library, it definitely supports SFTP and private key passwords. – Nickolay Olshevsky Dec 21 '12 at 10:24
WinSCP will support providing private key passphrase in .NET assembly since version 5.6: http://winscp.net/tracker/show_bug.cgi?id=816 – Martin Prikryl Jul 09 '14 at 07:15

Martin Prikryl · Answer 2 · 2016-10-11T13:30:55.980

1

The latest version of WinSCP .NET assembly does support setting passphrase to an encrypted private key.

Use the SessionOptions.PrivateKeyPassphrase.

SessionOptions sessionOptions = new SessionOptions
{
    ...
    SshPrivateKeyPath = "\\PrivateKey\\PrivateKey.ppk",
    SshPrivateKeyPassphrase = "passphrase",
};

See also Automating private key authentication in WinSCP FAQ.

edited Oct 11 '16 at 13:30

answered Feb 10 '16 at 17:39

Martin Prikryl

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"No supported authentication methods available" while connecting to SFTP using WinSCP in C#

2 Answers2