10/20/2016 · The resolution to this problem is that, if you want to programmatically access a SharePoint site that uses multiple authentication providers by using a set of Windows credentials, you must add an additional header to your request. The header name must be X-FORMS_BASED_AUTH_ACCEPTED and the value must be f.
specify X-FORMS_BASED_AUTH_ACCEPTED HTTP header The following example demonstrates how to consume SharePoint Search REST using HttpWebRequest class:, I just add the httpWebRequest.Headers.Add( X-FORMS_BASED_AUTH_ACCEPTED , f) to my request, I do not have the same headers answer anymore, but I still have 401 .
5/8/2018 · From last weekend to today (9 May 2018) I am also getting the ‘The Remote server returned an error: ( 401 ) Unauthorized’ System.Net.WebException error, where the detail status tells ProtocolError. The unmodified, proven-tested and working until today CSOM code I tried to run (repeat: always worked fine) with SharePoint Online was:, 2/25/2015 · add ( x-forms_based_auth_accepted , f) Register – ObjectEvent – InputObject $ clientContext – EventName ExecutingWebRequest – SourceIdentifier OnWebRequestExecuting – Action $ eventAction $ site = $ clientContext .
6/23/2017 · It basically requires the calling application to insert an additional HTTP header “ X-FORMS_BASED_AUTH_ACCEPTED ” in each web request to SharePoint to tell it to use Windows authentication.
9/14/2016 · Error returned from server: The remote server returned an error: ( 401 ) Unauthorized. We’ve tried using a user account, as well as a service account and they all return this error. The weird thing is, when using the Test Connection button in the action returns a OK message, and the Refresh button in the action returns the list of available web services to populate and be.
10/20/2016 · When using classic authentication, you expect that SharePoint will issue an HTTP status code of 401 at the client, indicating the types of HTTP authentication the server supports. However, in claims mode a more complex interaction occurs.
9/14/2015 · Yepp, for on premise you normally have windows auth in use. You can use: ProjectContext projContext = new ProjectContext(pwaPath) projContext.Credentials = new NetworkCredential(myUserID, mypwd, your domain) or if your user who is running the program has the appropriate rights granted, 3/3/2011 · Accessing mixed authentication web app with Client Object Model and Web Serices. I have mixed authentication web app in SharePoint 2010: both Windows (NTLM) and Forms based. When I tried to access it using Client Object Model with my NTLM credentials I got 401 (Unauthorized) exception. I googled and found this solution.
