Question

我有以下代码使用FTP检索文件（工作正常）。

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(svrPath);

            request.KeepAlive = true;
            request.UsePassive = true;
            request.UseBinary = true;

            request.Method = WebRequestMethods.Ftp.DownloadFile;
            request.Credentials = new NetworkCredential(uname, passw);

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            using (Stream responseStream = response.GetResponseStream())
            using (StreamReader reader = new StreamReader(responseStream))
            using (StreamWriter destination = new StreamWriter(destinationFile))
            {
                destination.Write(reader.ReadToEnd());
                destination.Flush();
            }

但是，当我尝试使用SSL执行此操作时，我无法访问该文件，如下所示：

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(svrPath);

            request.KeepAlive = true;
            request.UsePassive = true;
            request.UseBinary = true;

            // The following line causes the download to fail
            request.EnableSsl = true;

            request.Method = WebRequestMethods.Ftp.DownloadFile;
            request.Credentials = new NetworkCredential(uname, passw);

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            using (Stream responseStream = response.GetResponseStream())
            using (StreamReader reader = new StreamReader(responseStream))
            using (StreamWriter destination = new StreamWriter(destinationFile))
            {
                destination.Write(reader.ReadToEnd());
                destination.Flush();
            }

谁能告诉我为什么后者不起作用？

编辑：

我得到以下异常：

The remote server returned an error: (530) Not logged in.

Answer 1

您在哪里验证SSL证书？通过FTP连接执行SSL并不像设置.EnableSsl属性那么简单。您需要提供证书验证方法。有关C＃代码，请参阅this article以执行所需操作。此外，如果您需要更详细的实施，有人会在this MSDN article中复制并粘贴整个FTP类。

为了快速启动并快速运行，请测试：

if (request.EnableSsl) ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);

然后再说：

public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) {
 return true; // Read the links provided above for real implementation
}

Answer 2

试试这个 FtpWebRequest request =（FtpWebRequest）FtpWebRequest.Create（svrPath）;

使用SSL的WebRequest

2 个答案: