Dom parser failing on standard Windows reply

I am getting back a Windows reply "You are not authorized to view this pageThe Web server you are attempting to reach has a list of IP addresses that are not allowed to access the Web site, and the IP address of your browsing computer is on this list.

Please try the following:"

However, DomParser is failing all through the messge, with messages like “Fatal error … unterminated entity declaration ‘Content type’” on the first line.

My code couldn’t be simpler (I have tried all the Validation options)…

Set rtitem = New NotesRichTextItem ( iwnote, “DOM_output” )

Set inputStream = session.CreateStream

'Write text of Body item to stream

Call inputStream.WriteText(mHTTPResult)

'Reset position to beginning of stream

inputStream.Position = 0 'create DOM parser and process

Set domParser=session.CreateDOMParser(inputStream, rtitem)

domParser.InputValidationOption = VALIDATE_NEVER

domParser.process - fails here

Can one of the many gurus out there please help.