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Machine names and SPNs

A Service Principle Name (SPN) is the name by which a client uniquely identifies an instance of a service. By default your IIS machine has SPNs for its hostname, such as myServer, and its Fully Qualified Domain Name (FQDN), such as

If the proxy machine is accessed by a name other than either of these, such as,, or its IP address, then Active Directory authentication will not work. Your choices are:

SPNs can be viewed and changed with the setspn.exe tool, which Microsoft provides as part of the operating system. More information is available at

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