HRESULT 0xC03B001F (HNS_SWITCH_EXTENSION_NOT

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

the specified virtual switch extension does not exist on the switch.

Previous	Next
HNS_INVALID_IP	ERROR_SVHDX_ERROR_STORED

HNS_SWITCH_EXTENSION_NOT_FOUND

HNS_SWITCH_EXTENSION_NOT_FOUND is an HRESULT used by Windows Host Networking Service (HNS). It indicates that the requested Hyper-V vSwitch extension is not installed, enabled, or attached to the target switch.

What to check

List extensions on the intended virtual switch and verify their names, identifiers, and enabled state.
Check host feature and driver installation after upgrades, migrations, or network resets.
Do not apply an extension-dependent policy until the target switch exposes the required extension.

Microsoft documentation on Windows container networking and HNS

Looking for a different code? Search another status or error code.