Failed to launch ProSource Front Office


When trying to use the PSFO application, it fails and gives the following error:

The HTTP request is unauthorized with client authentication scheme 'Negotiate'; the authentication header received from the server was 'Negotiate, NTLM’.


Windows authentication set up is supported only through NTLM.  


Switch from Windows to NTLM mode by changing the clientCredentialType setting in the Web.config file, located at C:\Program Files\Schlumberger\ProSourceFrontOffice\DataService\Web.config as outlined in the following steps.

  1. Open IIS Manager and browse to UserInformationService.svc

  2. Select UserInformationService.svc service and switch to Features View.

  3. Right-click Windows Authentication and select Providers…

  4. Select Negotiate and click Remove.

  5. Make sure only NTLM is listed under Enabled Providers and click OK.