title: The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'Negotiate,NTLM'
body: <p>I have a WCF service which is being called from my web application.
  The WCF service call is made on SSL port 443.</p>
  
  <p>When my application makes the call, i recieve the following error message in my log file:
  The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'Negotiate,NTLM'</p>
  
  <p>I checked the iis authentication headers on my machine(IIs 5.1) and the machine where the WCF service is deployed(IIS 6.0) using the cscript command:</p>
  
  <p>For iis 5.1
  adsutil set w3svc/1/ntauthenticationproviders "Negotiate,NTLM"</p>
  
  <p>Simlilarly, the header has been set on server machine IIS 6.0 using the command:
  adsutil set w3svc/1/root/ntauthenticationproviders "Negotiate,NTLM"</p>
  
  <p>I have repeatedly checked the headers and they have the same value of "Negotiate,NTLM" at both ends, yet my service call is failing.</p>
  
  <p>Kindly help.</p>