CODEWITHSUNDEEP
c#.netftpfluentftp
Pradeep H
Pradeep H

Reputation: 613

FTP Connection issue- using FluentFTP for port 990 -TLS

I am trying download file through FTPS connection with port 990 (TLS) using FluentFTP.

But the code is not able to establish connection and showing exception as "The remote certificate is invalid according to the validation procedure."

The FTP server is connecting properly when I use FileZilla FTP tool manually (showing as it is connected through ftps over TLS (Implicit)

FtpClient fclient = new FtpClient(hostname, username, password); 
fclient.EncryptionMode = FtpEncryptionMode.Implicit;
fclient.SslProtocols = SslProtocols.Tls12; //Also tried with TLS1 and TLS
fclient.Port = 990;          
fclient.Connect();

Upvotes: 4

Views: 4716

Answers (2)

Martin.Martinsson
Martin.Martinsson

Reputation: 2154

Try this (taken from ConnectFTPSCertificate.cs example of FluentFTP). The important part is the callback OnValidateCertificate.

public static async Task ConnectFTPSCertificateAsync() {
    var token = new CancellationToken();
    using (var conn = new FtpClient("127.0.0.1", "ftptest", "ftptest")) {

        conn.EncryptionMode = FtpEncryptionMode.Explicit;
        conn.ValidateCertificate += new FtpSslValidation(OnValidateCertificate);
        await conn.ConnectAsync(token);
    }
}

private static void OnValidateCertificate(FtpClient control, FtpSslValidationEventArgs e) {
    if (e.PolicyErrors == System.Net.Security.SslPolicyErrors.None) {
        e.Accept = true;
    }
    else {
        // add logic to test if certificate is valid here
        // lookup the "Certificate" and "Chain" properties
        e.Accept = false;
    }
}

Upvotes: 2

L Y
L Y

Reputation: 1

I experienced the same issue. Pay attention that fluentFTP supports only external interfaces and not implicit I also tried ftpWebRequest without success. Try using winSCP.

Upvotes: -1

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