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

In the course of enabling WCF services using Windows authentication, you may have hit this error. A Bing search will show that there are a myriad of reasons as to why this might occur. However, before you get bogged down in the complexities of WCF bindings and IIS metadata, there ‘may’ be a simple fix….