In the earlier version of the SharePoint List adapters you had to modify the SharePointUtility code which is a VB project to be able to support HTTPS. Basically it uses the SharePoint list webservice and the WCF client configuration is performed in SharePointUtility code which needs to be modified to support HTTPS.

Here is some of the code that you can modify and try

Public Function RemoteCertificateValidationCallback(ByVal sender As Object, ByVal certificate As System.Security.Cryptography.X509Certificates.X509Certificate, ByVal chain As System.Security.Cryptography.X509Certificates.X509Chain, ByVal sslPolicyErrors As System.Net.Security.SslPolicyErrors) As Boolean

Return True

End Function

''' <summary>

''' Resets the conneciton for the current client which is used for the lists service

''' </summary>

''' <remarks></remarks>

Private Sub ResetConnection()

System.Net.ServicePointManager.ServerCertificateValidationCallback = New System.Net.Security.RemoteCertificateValidationCallback(AddressOf RemoteCertificateValidationCallback)

' Setup the binding with some enlarged buffers for SharePoint

Dim binding = New BasicHttpBinding()

' Change the security mode if we're using http vs https

If (_sharepointUri.Scheme.ToLower() = "http") Then

binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly

ElseIf (_sharepointUri.Scheme.ToLower() = "https") Then

binding.Security.Mode = BasicHttpSecurityMode.Transport

Else

Throw New ArgumentException("SharePoint URL Scheme is not recognized: " + _sharepointUri.Scheme)

End If

'@@ binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Windows

'@@ binding.Security.Transport.ProxyCredentialType = HttpClientCredentialType.Windows

'binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Ntlm

' Send credentials and adjust the buffer sizes (SharePoint can send big packets of data)

If (_sharepointUri.Scheme.ToLower() = "http") Then

binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Ntlm

ElseIf (_sharepointUri.Scheme.ToLower() = "https") Then

binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Windows

binding.Security.Transport.ProxyCredentialType = HttpClientCredentialType.Windows

End If

binding.MaxReceivedMessageSize = Int32.MaxValue

binding.ReaderQuotas.MaxBytesPerRead = Int32.MaxValue

binding.ReaderQuotas.MaxArrayLength = Int32.MaxValue

binding.ReaderQuotas.MaxDepth = Int32.MaxValue

binding.ReaderQuotas.MaxNameTableCharCount = Int32.MaxValue

binding.ReaderQuotas.MaxStringContentLength = Int32.MaxValue

binding.ReceiveTimeout = New TimeSpan(24, 0, 0)

' Create the client with the given settings

Dim ep = New EndpointAddress(_sharepointUri)

' Create the client object

If (Not _sharepointClient Is Nothing) Then

Dim dispose As IDisposable = _sharepointClient

dispose.Dispose()

_sharepointClient = Nothing

End If

_sharepointClient = New ListsSoapClient(binding, ep)

' Only need to add this once, the endpoint will be shared for future instances

Dim clientCredentials As Description.ClientCredentials = _

(From e In _sharepointClient.Endpoint.Behaviors _

Where TypeOf (e) Is Description.ClientCredentials).Single()

clientCredentials.Windows.AllowedImpersonationLevel = _

TokenImpersonationLevel.Impersonation

clientCredentials.Windows.ClientCredential = _credential

End Sub