Delphi and RestDebuger issue with NLTM authentication

Using the RestDebugger I cannot seem to connect to a Windows auth RESt service. Date=Tue, 01 May 2018 15:40:35 GMTContent-Length=0Server=Microsoft-IIS/8.5WWW-Authenticate=Negotiate, NTLMX-Powered-By=ASP.NET   What authentication must I use.