(C#) ConnectFailReason

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "login";
ftp.Password = "password";

// Connect and login to the FTP server.
bool success = ftp.Connect();
if (success != true) {

    // The possible failure reasons are:
    // 0 = success
    // 
    // Normal (non-TLS) sockets:
    // 1 = empty hostname
    // 2 = DNS lookup failed
    // 3 = DNS timeout
    // 4 = Aborted by application.
    // 5 = Internal failure.
    // 6 = Connect Timed Out
    // 7 = Connect Rejected (or failed for some other reason)
    // 
    // SSL/TLS:
    // 100 = TLS internal error.
    // 101 = Failed to send client hello.
    // 102 = Unexpected handshake message.
    // 103 = Failed to read server hello.
    // 104 = No server certificate.
    // 105 = Unexpected TLS protocol version.
    // 106 = Server certificate verify failed (the server certificate is expired or the cert's signature verification failed).
    // 107 = Unacceptable TLS protocol version.
    // 109 = Failed to read handshake messages.
    // 110 = Failed to send client certificate handshake message.
    // 111 = Failed to send client key exchange handshake message.
    // 112 = Client certificate's private key not accessible.
    // 113 = Failed to send client cert verify handshake message.
    // 114 = Failed to send change cipher spec handshake message.
    // 115 = Failed to send finished handshake message.
    // 116 = Server's Finished message is invalid.
    // 
    // FTP:
    // 200 = Connected, but failed to receive greeting from FTP server.
    // 201 = Failed to do AUTH TLS or AUTH SSL.
    // Protocol/Component:
    // 300 = asynch op in progress
    // 301 = login failure.

    int failReason = ftp.ConnectFailReason;

    Debug.WriteLine("connect fail reason = " + Convert.ToString(failReason));

    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// ..