All users or applications who request access to report server content or operations must be authenticated using the authentication type configured on the report server before access is allowed. The following table describes the authentication types supported by Reporting Services.
|AuthenticationType Name||HTTP Authentication Layer value||Used by default||Description|
|RSWindowsNegotiate||Negotiate||Yes||Attempts to use Kerberos for Windows Integrated authentication first, but falls back to NTLM if Active Directory cannot grant a ticket for the client request to the report server. Negotiate will only fall back to NTLM if the ticket is not available. If the first attempt results in an error rather than a missing ticket, the report server does not make a second attempt.|
|RSWindowsNTLM||NTLM||Yes||Uses NTLM for Windows Integrated authentication.
The credentials will not be delegated or impersonated on other requests. Subsequent requests will follow a new challenge-response sequence. Depending on network security settings, a user might be prompted for credentials or the authentication request will be handled transparently.
|RSWindowsKerberos||Kerberos||No||Uses Kerberos for Windows Integrated authentication. You must configure Kerberos by setting up setup service principle names (SPNs) for your service accounts, which requires domain administrator privileges. If you set up identity delegation with Kerberos, the token of the user who is requesting a report can also be used on an additional connection to the external data sources that provide data to reports.
Before you specify RSWindowsKerberos, be sure that the browser type you are using actually supports it. If you are using Internet Explorer, Kerberos authentication is only supported through Negotiate. Internet Explorer will not formulate an authentication request that specifies Kerberos directly.
|RSWindowsBasic||Basic||No||Basic authentication is defined in the HTTP protocol and can only be used to authenticate HTTP requests to the report server.
Credentials are passed in the HTTP request in base64 encoding. If you use Basic authentication, use Secure Sockets Layer (SSL) to encrypt user account information before it is sent across the network. SSL provides an encrypted channel for sending a connection request from the client to the report server over an HTTP TCP/IP connection. For more information, see Using SSL to Encrypt Confidential Data on the Microsoft TechNet Web site.
|Custom||(Anonymous)||No||Anonymous authentication directs the report server to ignore authentication header in an HTTP request. The report server accepts all requests, but call on a custom ASP.NET Forms authentication that you provide to authenticate the user.
Specify Custom only if you are deploying a custom authentication module that handles all authentication requests on the report server. You cannot use the Custom authentication type with the default Windows Authentication extension.