|**AuthenticationTypes**|Specifies one or more authentication types. Valid values are: **RSWindowsNegotiate**, **RSWindowsKerberos**, **RSWindowsNTLM**, **RSWindowsBasic**, and **Custom**.<br /><br /> **RSWindows** types and **Custom** are mutually exclusive.<br /><br /> **RSWindowsNegotiate**, **RSWindowsKerberos**, **RSWindowsNTLM**, and **RSWindowsBasic** are cumulative and can be used together, as illustrated in the default value example earlier in this section.<br /><br /> Specifying multiple authentication types is necessary if you expect requests from a variety of client applications or browsers that use different types of authentication.<br /><br /> Do not remove **RSWindowsNTLM**, otherwise you will limit browser support to a portion of the supported browser types. For more information, see [Browser Support for Reporting Services and Power View](../../reporting-services/browser-support-for-reporting-services-and-power-view.md).|N|
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