FluentFTP：根據驗證程序遠程證書無效

Question

當我嘗試連接到我的 FTP 服務器以使用 FluentFTP 上傳文件時，我得到以下信息：

根據驗證程序，遠程證書無效。

然而 FileZilla 運行良好，沒有錯誤或警告。

我是不是做錯了什么，如果它實際上是服務器的問題，我怎么能忽略這個錯誤

這是我的代碼：

var credentials = new NetworkCredential(Username, Password);
FtpClient client = new FtpClient(Host, credentials)
{
    Port = Port,
    EncryptionMode = FtpEncryptionMode.Explicit
};
client.DataConnectionEncryption = true;

client.Connect();
var result = client.UploadFileAsync(FilePathName, RemotePathName, AllowOverwrite ? FtpExists.Overwrite : FtpExists.Skip, CreateRemoteDirectory, token).GetAwaiter().GetResult();
client.Disconnect();

我還嘗試添加事件client.ValidateCertificate += Client_ValidateCertificate;

private static void Client_ValidateCertificate(FtpClient control, FtpSslValidationEventArgs e)
{
    e.PolicyErrors = SslPolicyErrors.None;
}

但我無法讓它工作，我仍然遇到同樣的錯誤。

這是 FileZilla 的輸出：

Status: Selected port usually in use by a different protocol.
Status: Resolving address of xxxxxxxxxxxxxxxxxxxxxx
Status: Connecting to xxx.xxx.xxx.xxx:xx...
Status: Connection established, waiting for welcome message...
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Status: Logged in
Status: Retrieving directory listing of "xxxxxxxxxxxxx"...
Status: Directory listing of "xxxxxxxxxxxxx" successful

Answer 1

Client_ValidateCertificate需要像這樣手動接受證書：

private static void Client_ValidateCertificate(FtpClient control, FtpSslValidationEventArgs e)
{
    e.Accept = true;
}

然而，盲目地接受任何證書確實是一個壞主意。 我最終做了這樣的事情：

private void Client_ValidateCertificate(FtpClient control, FtpSslValidationEventArgs e)
{
    if (e.PolicyErrors == SslPolicyErrors.None || e.Certificate.GetRawCertDataString() == TrustedRawCertData)
    {
        e.Accept = true;
    }
    else
    {
        throw new Exception($"{e.PolicyErrors}{Environment.NewLine}{GetCertificateDetails(e.Certificate)}");
    }
}