VB.NET

Check FTP Connection and Login Status

Demonstrates the connection-status properties ConnectVerified, LoginVerified, ConnectFailReason, and Greeting.

Background: When Connect fails, these properties separate the possible causes: ConnectVerified shows whether the TCP connection was established at all, LoginVerified whether authentication then succeeded, and ConnectFailReason gives a numeric code pinpointing the failure — far more actionable than a generic error for distinguishing, say, an unreachable host from a bad password. The Greeting captures the server's opening banner, sometimes useful for identifying the server or its policies.

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VB.NET

Dim success As Boolean = False

Dim ftp As New Chilkat.Ftp2

ftp.Hostname = "ftp.example.com"
ftp.Username = "myFtpLogin"

'  Normally you would not hard-code the password in source.  You should instead obtain it
'  from an interactive prompt, environment variable, or a secrets vault.
ftp.Password = "myPassword"

success = ftp.Connect()
If (success <> True) Then
    '  ConnectFailReason gives a numeric code describing why Connect failed.
    Debug.WriteLine("Connect failed, reason code: " & ftp.ConnectFailReason)
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


'  After a successful connect, these flags report what succeeded.
Debug.WriteLine("TCP connection verified: " & ftp.ConnectVerified)
Debug.WriteLine("Login verified: " & ftp.LoginVerified)

'  The Greeting property holds the server's initial greeting banner.
Debug.WriteLine("Server greeting: " & ftp.Greeting)

success = ftp.Disconnect()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If