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Registering an SPN for SQL Server

Jack Vamvas explains how to register an SPN for SQL Server:

I received a question from a colleague asking how to register a Service Principal Name (SPN) for SQL Server. The specific situation relates to upgrades and new SQL Server instances deployed onto new servers\server names . 

Defining an SPN results in an Active Directory name – allowing a client to uniquely identify  the service instance.  The SPN is comprised of a service name with a computer and user account resulting in a Service id. 

Read on for the process.