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SPN
Last modified: Thursday, August 25, 2005 

SPN, short for service principal name,  is the name by which a client uniquely identifies an instance of a service. If you install multiple instances of a service on computers throughout a forest, each instance must have its own SPN. A given service instance can have multiple SPNs if there are multiple names that clients might use for authentication. For example, an SPN always includes the name of the host computer on which the service instance is running, so a service instance might register an SPN for each name or alias of its host. [Source: MSDN Library]

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Name Formats for Unique SPNs
An SPN must be unique in the forest in which it is registered. If it is not unique, authentication will fail. The SPN syntax has four elements: two required elements and two additional elements that you can use, if necessary, to produce a unique name as listed in the following table.

Service Principal Names — MSDN Library
An overview and information on SPN, provided by the MSDN library archive.

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