Files Uploads sometimes but fails most of the time. getting error SSH.NET (Permission denied (publickey))

[DevMusaab]

I am trying to upload file using SFTP. The file gets uploaded sometimes and most the times it throws the error SSH.NET (Permission denied (publickey)) The SFTP server accepts only whitelist IP addresses.

public void SetConnection(string userName, string strRSAKey)
        {
            var authMethods = new List<AuthenticationMethod>();
            authMethods.Add(new PrivateKeyAuthenticationMethod(
                userName, 
                new[] { new PrivateKeyFile(GenerateStream(strRSAKey)) }
                ));

            connectionInfo = new ConnectionInfo(hostName, port, userName, authMethods.ToArray());
        }

        public bool UploadFile(string sourceFilePath, string destinationFilePath)
        {
            if (connectionInfo != null)
            {
                using (var client = new SftpClient(connectionInfo))
                {
                    client.Connect();
                    if (client.IsConnected)
                    {
                        var csvFile = File.Open(sourceFilePath, FileMode.Open);
                        client.UploadFile(csvFile, destinationFilePath, true);
                        csvFile.Dispose();
                    }
                    client.Disconnect();
                    return true;
                }
            }
            return false;
        }

        private Stream GenerateStream(string str)
        {
            var stream = new MemoryStream();
            var writer = new StreamWriter(stream);
            writer.Write(str);
            writer.Flush();
            stream.Position = 0;
            return stream;
        }

[codex-nz]

I encountered something similar and used the following that seemed to get me further (only to hit another bug/undefined feature):

using (var privateKeyFile = new PrivateKeyFile(_options.PrivateKeyPath))
using (var connectionInfo = new PrivateKeyConnectionInfo(_options.Host, _options.Username, privateKeyFile))
using (_client = new SshClient(connectionInfo))
{ }

NOTE: the use of PrivateKeyConnectionInfo in place of ConnectionInfo.
Hope this helps..

[WojciechNagorski]

Fixed by #1177 and #1180

[WojciechNagorski]

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