Creating the endpoint for Kerberos authentication - Amazon Relational Database Service
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Creating the endpoint for Kerberos authentication

Kerberos-based authentication requires that the endpoint be the customer-specified host name, a period, and then the fully qualified domain name (FQDN). For example, the following is an example of an endpoint you might use with Kerberos-based authentication. In this example, the SQL Server DB instance host name is ad-test and the domain name is corp-ad.company.com. 

ad-test.corp-ad.company.com

If you want to make sure your connection is using Kerberos, run the following query: 

SELECT net_transport, auth_scheme 
  FROM sys.dm_exec_connections 
 WHERE session_id = @@SPID;