URGENT VB6 Visual Basic 6 - xmlhttp The download of the specified resource has failed

We are getting this error using the following:

Please help ?

The download of the specified resource has failed

Dim objHTTP As New xmlhttp
'Dim objHTTP As New xmlhttp


Post = api_xml_request
eventlog = "open objHTTP"
url = "https://api.ebay.com/ws/api.dll" ' LIVE EBAY
'''' url = "https://api.sandbox.ebay.com/ws/api.dll"
objHTTP.open "POST", url, False
objHTTP.setRequestHeader "Content-type", "text/xml;charset=""utf-8"""
objHTTP.setRequestHeader "X-EBAY-API-COMPATIBILITY-LEVEL", "961"
objHTTP.setRequestHeader "X-EBAY-API-SITEID", "3"
objHTTP.setRequestHeader "X-EBAY-API-CALL-NAME", apicall
objHTTP.setRequestHeader "X-EBAY-API-DEV-NAME", "58874018-0523-4c6f-8dd2-f320043b552b"
objHTTP.setRequestHeader "X-EBAY-API-APP-NAME", "Pinnacle-9eb7-40d2-9090-38cf66c85b11"
objHTTP.setRequestHeader "X-EBAY-API-CERT-NAME", "0606854f-c048-49eb-b1da-f1c77d66d7b2"

eventlog = "POST objHTTP"
objHTTP.send (Post)