FTPWebRequest using SSL

[simonm]

I'm having problems accessing a webserver using SSL. It works fine without it, but when I set FTPWebRequest.EnableSSL = True, I get the following error:

"The remote certificate is invalid according to the validation procedure"

The FTP server I'm trying to connect to does not require the client to have a certificate. It issues it's own certificate. Does anyone know what I have to do to get this to work?

[mendhak]

Is the certificate that the server issues valid itself? Also, if you're willing to ignore such certificate issue errors, then implement an ICertificatePolicy class which returns true for every check of validation results.

[simonm]

Well, I'm informed that it is valid but I have idea how I would check it.

Anyway, I think I've done something similar by implementing the following:

    Private Function CertificateAuthenticate( _
            ByVal sender As Object, _
            ByVal certificate As X509Certificate, _
            ByVal chain As X509Chain, _
            ByVal sslPolicyErrors As SslPolicyErrors _
    ) As Boolean

        Return True

    End Function

    Public Sub New()
        ServicePointManager.ServerCertificateValidationCallback = New System.Net.Security.RemoteCertificateValidationCallback(AddressOf CertificateAuthenticate)
    End Sub

I must say that it seems like a rather convoluted way of doing things. Why I couldn't just turn off certificate checking on the FTPWebRequest object I don't know...