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HNS_POLICY_ALREADY_EXISTS
HNS_POLICY_ALREADY_EXISTS is an HRESULT used by Windows Host Networking Service (HNS). It indicates that the requested policy would duplicate a policy already associated with the HNS object.
What to check for HNS_POLICY_ALREADY_EXISTS
- List policies already applied to the target network, endpoint, or port.
- Compare policy identity and content before treating the result as a safe idempotent success.
- Avoid adding duplicate rules from concurrent startup or retry paths.
For HNS_POLICY_ALREADY_EXISTS, Microsoft documentation on Windows container networking and HNS
Diagnostic interpretation of HNS_POLICY_ALREADY_EXISTS
HNS_POLICY_ALREADY_EXISTS has the HRESULT value 0xC03B0012. AllStat records the condition as “Policy information already exists on this object.”. For HNS_POLICY_ALREADY_EXISTS, in practice, interpret that wording at the boundary owned by the Windows component or COM interface that returned the HRESULT, rather than treating the value as a generic Windows message.
Evidence to capture for HNS_POLICY_ALREADY_EXISTS
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0xC03B0012 value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions HNS_POLICY_ALREADY_EXISTS or the hns / policy / already / exists operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original hns / policy / already / exists condition.
Retry and recovery for HNS_POLICY_ALREADY_EXISTS
Retry HNS_POLICY_ALREADY_EXISTS only when the owning API documents a transient state or after the condition described as “Policy information already exists on this object.” has changed. For HNS_POLICY_ALREADY_EXISTS, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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