HRESULT 0xC03B0018 (HNS_SHARED_SWITCH

Status / error code:

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Description:

a virtual switch shared by multiple networks cannot be modified.

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HNS_DEGRADED_OPERATION	HNS_GUID_CONVERSION_FAILURE

HNS_SHARED_SWITCH_MODIFICATION

HNS_SHARED_SWITCH_MODIFICATION is an HRESULT used by Windows Host Networking Service (HNS). It indicates that the requested change would alter a vSwitch currently shared by more than one HNS network.

What to check

Identify every HNS network using the virtual switch before planning a switch-level change.
Move or remove dependent networks in a controlled maintenance window when modification is required.
Apply settings at a network or endpoint scope when that avoids modifying the shared switch.

Microsoft documentation on Windows container networking and HNS

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