SOAP Request crashes

Hello Forum,

i create an http-Object that accesses a https-page. This page requires username and password. I alwayg get the message “msxml3.dll:A certificate is required to complete client authentication”, when i start the script.

Does anyone have an idea what is wrong? See the following script. This script works with other urls and without the header “Authorization” correctly…

Dim strReturn ’ As String

Dim objHTTP ’ As MSXML.XMLHTTPRequest

If Len(strURL) Then

Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")

objHTTP.open strSendType, strURL,False

	

If strSendType = "POST" Then

	objHTTP.setRequestHeader "Content-Type", "text/xml"

	Dim base64 As New Base64()

		objHTTP.setRequestHeader "Authorization", "Basic " + base64.encode("USERNAME:PASSWORD")

	End If

	

objHTTP.send strPOSTString 'Get it.

strReturn =objHTTP.responseText

End If

Set objHTTP = Nothing