SharePoint 2013 CSOM Error : Custom Login Page (Forms Based / Mixed mode authentication)

If you have a SharePoint On Premise installation with a Custom Login Page , you might encounter issues working with CSOM. The error would be primarily related to Authentication Failure. The following solution worked for me.

Step 1: The Custom Login Page should be placed in IIS Virtual Directory.

As a general practise the custom login page is normally placed in the 15 Hive Layouts folder. Move/Copy the ASPX file of your custom login page from the 15 hive layouts folder to the following folder in IIS Virtual directory of the concerned Web Application:

“C:inetpubwwwrootwssVirtualDirectories<yoursite>_forms”

Step 2: Edit the Custom Login page file to make sure the master page url is correct.

After the movement of the ASPX file, open the file in a notepad and check for the MasterPageFile value and change it to the following =”~/_layouts/15/simple.master“.

Step 3: Change the Custom Login Page Url in Central Administration.

Navigate to Central Admin and change the Url defined in Custom Login Page for the Web App ( Manage Web Application –> Select Web App –> Authentication Providers) to the following : “~/_forms/customlogin.aspx”

Step 4: For Mixed Mode Authentication Only.

If you are using Forms based authentication , you are already ready to go , however if you have mixed mode authentication then make sure to add the following event handler in the CSOM code :

ClientContext clientContext = new ClientContext(“http://servername/“);
clientContext.ExecutingWebRequest += new EventHandler<WebRequestEventArgs>(clientContext_ExecutingWebRequest);
Web site = clientContext.Web;
clientContext.Load(site);
clientContext.ExecuteQuery();
static void clientContext_ExecutingWebRequest(object sender, WebRequestEventArgs e)
{
e.WebRequestExecutor.WebRequest.Headers.Add(“X-FORMS_BASED_AUTH_ACCEPTED”, “f”);
}

CSOM should work fine now !!

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