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Key Exchange Negotiation Failed #858

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Key Exchange Negotiation Failed#858
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RSA SHA-2
Milestone
2023.0.0

Description

@LoneWolfPlanet
LoneWolfPlanet
opened on Aug 9, 2021

Hello sirs.
I have verified both supported Key Exchange Methods in the server and client using "ssh -Q kex" command
and found that they the same methods .
But still I'm encountering the issue below.

Code
using(SftpClient client = new SftpClient( "hostname", "username" , "password")){
client.Connect();
}

Stack Trace
Key exchange negotiation failed.
at Renci.SshNet.Security.KeyExchange.Finish() + 0x71
at Renci.SshNet.Security.KeyExchangeECCurve25519.Finish() + 0xe
at Renci.SshNet.Security.KeyExchangeECCurve25519.Session_KeyExchangeEcdhReplyMessageReceived(Object, MessageEventArgs`1) + 0x3f
at Renci.SshNet.Session.OnKeyExchangeEcdhReplyMessageReceived(KeyExchangeEcdhReplyMessage) + 0x60
at Renci.SshNet.Messages.Transport.KeyExchangeEcdhReplyMessage.Process(Session) + 0x14
at Renci.SshNet.Session.MessageListener() + 0x53
at Renci.SshNet.Session.WaitOnHandle(WaitHandle, TimeSpan) + 0x100
at Renci.SshNet.Session.WaitOnHandle(WaitHandle) + 0x16
at Renci.SshNet.Session.Connect() + 0x2d7
at Renci.SshNet.BaseClient.CreateAndConnectSession() + 0x12c
at Renci.SshNet.BaseClient.Connect() + 0x9b

Activity

  1. IgorMilavec commented on Aug 18, 2021

    @IgorMilavec
    IgorMilavec
    on Aug 18, 2021
    Collaborator

    Can you try to disable ECC25519 to see if it is able to verify using other methods?

    ConnectionInfo connectionInfo = new ConnectionInfo(
    host,
    port,
    userName,
    authenticationMethods);

connectionInfo.KeyExchangeAlgorithms.Remove("curve25519-sha256");
connectionInfo.KeyExchangeAlgorithms.Remove("curve25519-sha256@libssh.org");

SftpClient client = new SftpClient(connectionInfo)

  2. ckorn commented on Aug 4, 2022

    @ckorn
    ckorn
    on Aug 4, 2022

    I deleted my comments because my issue was just a wrong host key fingerprint.

  3. WojciechNagorski
    added this to the 2023.0.0 milestone on Sep 18, 2023
  4. WojciechNagorski
    added
    RSA SHA-2
    on Sep 18, 2023

  5. WojciechNagorski commented on Sep 23, 2023

    @WojciechNagorski
    WojciechNagorski
    on Sep 23, 2023
    Collaborator

    Fixed by #1177 and #1180

  6. WojciechNagorski
    closed this as completedon Sep 23, 2023

  7. WojciechNagorski commented on Oct 10, 2023

    @WojciechNagorski
    WojciechNagorski
    on Oct 10, 2023
    Collaborator

    Version 2023.0.0 has been published https://www.nuget.org/packages/SSH.NET/2023.0.0

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