Exception: 'Key exchange negotiation failed.' in Visual Studio 2017

[akira32]

I use visual studio 2017(Windows 10 OS) windows form assign Renci.SshNet as a reference. I add a button to call new SshClient with IP, account, password.

		private void button1_Click(object senderMy, EventArgs eMy)
		{
			byte[] expectedFingerPrint = new byte[] {
											0x66, 0x31, 0xaf, 0x00, 0x54, 0xb9, 0x87, 0x31,
											0xff, 0x58, 0x1c, 0x31, 0xb1, 0xa2, 0x4c, 0x6b
										};

			using (var client = new SshClient("192.168.x.x", "x", "x"))
			{
				client.HostKeyReceived += (sender, e) =>
				{
					if (expectedFingerPrint.Length == e.FingerPrint.Length)
					{
						for (var i = 0; i < expectedFingerPrint.Length; i++)
						{
							if (expectedFingerPrint[i] != e.FingerPrint[i])
							{
								e.CanTrust = false;
								break;
							}
						}
					}
					else
					{
						e.CanTrust = false;
					}
				};
				client.Connect();
			}
		}

But when I click the button and then Unhandled Exception window appears. The error message as below:

Renci.SshNet.Common.SshConnectionException: 'Key exchange negotiation failed.'

Does somebody know how to solve this problem?

        private ISession CreateAndConnectSession()
        {
            var session = _serviceFactory.CreateSession(ConnectionInfo);
            session.HostKeyReceived += Session_HostKeyReceived;
            session.ErrorOccured += Session_ErrorOccured;

            try
            {
                session.Connect();
                return session;
            }
            catch
            {
                DisposeSession(session);
                throw;//<=======Renci.SshNet.Common.SshConnectionException: 'Key exchange negotiation failed.'
            }
        }

[darinkes]

You just copied the Hostkey-Fingerprint from the example in the Readme.
Of course yours is different.

client.HostKeyReceived += (sender, e) =>
{
        if (expectedFingerPrint.Length == e.FingerPrint.Length)
        {
                for (var i = 0; i < expectedFingerPrint.Length; i++)
                {
                        if (expectedFingerPrint[i] != e.FingerPrint[i])
                        {
                                e.CanTrust = false;
                                break;
                        }
                }
        }
        else
        {
                e.CanTrust = false;
        }
};

This will always set e.CanTrust = false, since your expectedFingerPrint is wrong. And the Key Exchange fails. Set the bytes in expectedFingerPrint to your values.