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ERROR_KM_DRIVER_BLOCKED
This result is explicitly tied to a policy that blocks the legacy kernel-mode printer driver model associated with Windows NT 4.0 drivers. The failure occurs at the driver-policy boundary, so repeatedly reconnecting the printer or restarting the spooler does not make that driver model acceptable.
For migration work, identify the exact driver selected by the queue and replace the legacy package with a supported driver model. Current Windows printing guidance emphasizes packaged drivers and, for new device development, the modern IPP print platform rather than legacy kernel-mode printer components.
What to preserve for remediation
- Driver name, environment, version, provider, and package identity.
- The queue or remote connection that selected the blocked driver.
- The effective printer policy configuration on the client or print server where the block is reported.
- Whether a vendor-supported packaged or inbox driver is available for the device.
Microsoft printer policy guidance · Print driver packages · Printer Driver Installation Reference
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