问 FluentFTP:根据验证过程，远程证书无效

当我试图连接到我的FTP服务器来用FluentFTP上传一个文件时，我得到以下信息：

根据验证过程，远程证书无效。

然而，FileZilla工作正常，没有错误或警告。

我做错什么了吗?如果服务器出了问题，我怎么能忽略这个错误？

这是我的密码：

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();

我还尝试添加事件 client.ValidateCertificate += Client_ValidateCertificate;

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

但我也不能让它起作用--我还是会犯同样的错误。

下面是FileZilla的输出：

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