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    How to use SPNs when you configure Web applications that are hosted on Internet Information Services UM Temporary authentication failure Validate SPN mappings using Windows PowerShell Exchange 2010 UM calls to voicemail drops   search for duplicate SPNs c:\>setspn -X Checking domain DC=msft,DC=com,DC=tw Processing entry 0 SmtpSvc/TWmsftEX01 is registered on these accounts:         CN=Administrator,CN=Users,DC=msft,DC=com,DC=tw         CN=TWmsftEX01,CN=Computers,DC=msft,DC=com,DC=tw SmtpSvc/TWmsftEX01.msft.com.tw is registered on these accounts:         CN=Administrator,CN=Users,DC=msft,DC=com,DC=tw         CN=TWmsftEX01,CN=Computers,DC=msft,DC=com,DC=tw found 2 groups of duplicate SPNs. c:\> setspn -D smtpsvc/twmsftex01.msft.com.tw twmsftex01 Unregistering ServicePrincipalNames for CN=TWmsftEX01,CN=Computers,DC=msft,DC=com, DC=tw         smtpsvc/twmsftex01.msft.com.tw Updated object   Import-