SslStream.AuthenticateAsClient - 非阻塞套接字操作无法在发送时立即完成

Question

我目前正在尝试使用 TcpClient 连接到 FTP 服务器。为了使用 FTPS 作为协议，我将 NetworkStream 处理为一个单独的方法，该方法使用该方法创建 SslStream 然后 SslStream.AuthenticateAsClient 被调用并抛出异常 发送时无法立即完成非阻塞套接字操作 。实际流由 TcpClient.GetStream 方法初始化。实际上源代码来自 Biko 库，您可以在这里找到该部分：https://biko.codeplex.com/SourceControl/latest#Biko/Starksoft%20Biko/Net/Ftp/FtpBase.cs

private Stream CreateSslStream(Stream stream)
    {
        // create an SSL or TLS stream that will close the client's stream
        SslStream ssl = new SslStream(stream, true, new RemoteCertificateValidationCallback(secureStream_ValidateServerCertificate), null);

        // choose the protocol
        SslProtocols protocol = SslProtocols.None;
        switch (_securityProtocol)
        {
            case FtpSecurityProtocol.Tls1OrSsl3Explicit:
            case FtpSecurityProtocol.Tls1OrSsl3Implicit:
                protocol = SslProtocols.Default;
                break;
            case FtpSecurityProtocol.Ssl2Explicit:
            case FtpSecurityProtocol.Ssl2Implicit:
                protocol = SslProtocols.Ssl2;
                break;
            case FtpSecurityProtocol.Ssl3Explicit:
            case FtpSecurityProtocol.Ssl3Implicit:
                protocol = SslProtocols.Ssl3;
                break;
            case FtpSecurityProtocol.Tls1Explicit:
            case FtpSecurityProtocol.Tls1Implicit:
                protocol = SslProtocols.Tls;
                break;
            default:
                throw new FtpSecureConnectionException(String.Format("unexpected FtpSecurityProtocol type '{0}'", _securityProtocol.ToString()));
        }

        // note: the server name must match the name on the server certificate.
        try
        {
            // authenticate the client
            ssl.AuthenticateAsClient(_host, _clientCertificates, protocol, true);
        }
        catch (AuthenticationException authEx)
        {
            throw new FtpAuthenticationException("Secure FTP session certificate authentication failed.", authEx);
        }

        return ssl;
    }

所以，我的问题是，我如何修改源代码以便不再抛出此异常？我无法删除身份验证，但错误也应该消失。是什么原因导致此错误？

提前致谢。

Answer 1

已修复。我刚刚更新到更新版本的库。该问题是由作者通过添加lock-关键字解决的线程问题引起的。

SslStream.AuthenticateAsClient - 非阻塞套接字操作无法在发送时立即完成

SslStream.AuthenticateAsClient - A non-blocking socket operation could not be completed immediately on send

.net

c#

sockets

ftp