SYSPREP Unattend file [C:\Windows\Panther\unattend.xml] has already been processed.

Ralf Geglin 0 Reputation points
2025-08-08T11:39:58.5866667+00:00

When we try to sysprep a W2K19 Instance to prepare as an Image we get the sysprep error [sysprep.exe] UnattendFindAnswerFile: Unattend file [C:\Windows\Panther\unattend.xml] has already been processed.

and sysprep will be not executed.

When we run sysprepon a fresh server with the same unattend.xml its working. When we prepare the server with our agents and run it we get this error.

How can we fix that ?

Windows for business | Windows Server | Devices and deployment | Set up, install, or upgrade
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