API Error: The Authentication Header Received was ‘Negotiate,NTLM’

Issue

If you are using XMPro API or any XMPro modules which use API, for example, XMMobile, Business ActivityA specific step in a process.  It will be the user interface for that step (web form or a screen), for example, the Leave Application (screen interface or web form) will be the first Activity in the Leave Requisition process.  The Leave Application Authorization will be the second step or Activity in the Leave Requisition process.  One Process can have multiple activities. Monitor,  etc., and you receive the following error while trying to log in:

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

Resolution

The possible cause for this problem could be that Anonymous authentication is not enabled on services folder of XMWorkspace.

Please enable Anonymous authentication as shown below: