To authenticate to SharePoint using Kerberos, set the following properties:

AuthScheme: Set this to KERBEROS

KerberosKDC: Set this to the host name or IP Address of your Kerberos KDC machine.

KerberosRealm: Set this to the realm of the SharePoint Kerberos principal. This will be the value after the '@' symbol (for instance, EXAMPLE.COM) of the principal value (for instance, MyService/MyHost@EXAMPLE.COM).

KerberosSPN: Set this to the service and host of the SharePoint Kerberos Principal. This will be the value prior to the '@' symbol (for instance, MyService/MyHost) of the principal value (for instance, MyService/MyHost@EXAMPLE.COM).