C#

ConnectFailReason

See more FTP Examples

The ConnectFailReason property can be examined to determine the reason why the Connect method failed. The possible values are listed in the source code below: C#

bool success = false;

//  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.
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;
}

//  ...