How do I link two SQL Server instances with Kerberos?
First, open SQL Server Management Studio and connect to the instance of your choice. Then, go down to “Server Objects” and right-click on “Linked Server” node. A contextual menu should appear. Click on “New Linked Server…”.
What is SPN Kerberos?
A service principal name (SPN) is a unique identifier of a service instance. SPNs are used by Kerberos authentication to associate a service instance with a service logon account. This allows a client application to request that the service authenticate an account even if the client does not have the account name.
How to use Kerberos to connect to SQL Server?
Using Kerberos integrated authentication to connect to SQL Server. Beginning in Microsoft JDBC Driver 4.0 for SQL Server, an application can use the authenticationScheme connection property to indicate that it wants to connect to a database using type 4 Kerberos integrated authentication.
How is the user account used in Kerberos?
The user account is used to authenticate to the web server. The web server uses its constrained delegation ability to request a Kerberos ticket on the user’s behalf for connection to SQL1. If we were to audit the connections we would see the users account is being used to access the web page and the data on the SQL server.
Can a Kerberos aware application support constrained delegation?
Constrained delegation is not supported by all Kerberos aware applications. The domain functional level must be 2003. It allows the administrator to selectively allow an account to request Kerberos tickets limited to specific services on specific servers. This is a much more secure method of delegating Kerberos delegation.
Why is NTLM being used instead of Kerberos?
Frequently when there are configuration problems the client will be prompted for credentials and this may mean NTLM is being used instead of Kerberos. NTLM credentials cannot be delegated off the system so authentication to the backup server will be in the form of anonymous authentication.