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 … Click here to continue reading.