What does HRESULT 0xC00D1391 (NS_E_NAMESPACE_CALLBACK_NOT_FOUND) mean?

NS_E_NAMESPACE_CALLBACK_NOT_FOUND

Mechanism and scope

This result (0xC00D1391) marks an unregister operation names a callback that is not attached to the node. The code identifies a narrow server contract, so diagnosis should preserve the object instance and the first native return.

Windows Media Services persists server configuration as a typed hierarchy; nodes have names, value types, security classifications and persistence rules; callbacks are attached to particular nodes rather than to arbitrary strings. In the trace, when configuration was imported or replicated, compare ServerNamespace.xml, NameSpaceDelta.xml and plug-in registrations, but do not edit those files while WMServer is running.

Test the owning precondition

1. Capture 0xC00D1391, this result, the exact API/administrative action and the first failure timestamp.
2. Preserve node path, callback identity, earlier registration result, plug-in generation and shutdown order.
3. Perform one isolated experiment: pair registration and removal in the same object instance and ignore removal only when absence is an explicitly valid state.

Code-specific failure anatomy

A representative occurrence is when an unregister operation names a callback that is not attached to the node. Capture node path, callback identity, earlier registration result, plug-in generation and shutdown order together with the object instance and the exact administrative or protocol request.

For a useful negative control, pair registration and removal in the same object instance and ignore removal only when absence is an explicitly valid state.

The tempting but misleading response is registering a new callback merely to make removal succeed; that hides the ownership bug. That action does not test the distinction that matters here: node not found concerns the configuration node itself, while it concerns an observer missing from an existing node.

Evidence that separates this code

Changes that do not establish the cause

• registering a new callback merely to make removal succeed; that hides the ownership bug.
• Avoid changing the publishing point, protocol, content and plug-in set in one test; such a test cannot show which precondition cleared the code.

Related codes are different

Primary distinction: node not found concerns the configuration node itself, while it concerns an observer missing from an existing node.

Technical references

• Server Context
• Command Context
• Replicating a Windows Media server
• Microsoft HRESULT registry