KMS caching

KMS caching

By default a KMS client will cache the KMS host that it was able to activate with and will communicate directly with this host when it is time to reactivate (instead of querying DNS). If the client cannot contact the cached KMS host, discovery with DNS will be used.

You are able to disable the caching with the following command:

slmgr /ckhc (or cscript c:windowssystem32slmgr.vbs /ckhc)

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To enable caching again use the command:

slmgr /skhc (or cscript c:windowssystem32slmgr.vbs /skhc)

You can verify if caching is active with the command:

slmgr /dli (or cscript c:windowssystem32slmgr.vbs /dli)

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Office 2010 will also cache the KMS server used, but in order to disable this you will need to set a registry key:

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftOfficeSoftwareProtectionPlatform]
“DisableKeyManagementServiceHostCaching”=dword:00000001

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Modern Workplace consultant and a Microsoft MVP in Enterprise Mobility.
Modern Workplace consultant and a Microsoft MVP in Windows and Devices for IT.

Infrastructure architect with focus on Modern Workplace and Microsoft 365 security.

Passionate IT professional with 20+ experience in IT architecture, consulting, and design. 

Cloud & security specialist with focus on Microsoft backend products and cloud technologies.

Infrastructure architect with focus on design, implementation, migration and consolidation.

Infrastructure consultant with focus on cloud solutions in Office365 and Azure.

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