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COMADMIN_E_APPLID_MATCHES_CLSID
COM+ catalog object and collection state: exact meaning of COMADMIN_E_APPLID_MATCHES_CLSID
The proposed COM+ application ID collides with an installed class CLSID. Application creation validates global GUID namespaces before adding the new AppID.
Windows describes this condition as “A CLSID with the same GUID as the new application ID is already installed on this machine”.
Evidence to collect before repair
- Record collection name, parent key, object key, and application/partition ID.
- Preserve the exact administration method and pending property values; it anchors the failure to the real administration object.
- Evidence should include ErrorInfo entries and COM+ System Application events, captured before a repair changes state.
Where the result occurs
The authoritative state is the logical COM+ catalog exposed through COMAdmin collections, not a single registry key or an old in-memory object. In the specific case of this result, resolve the GUID as both AppID and CLSID and identify the binary owning the existing class registration.
Diagnostic sequence
- To isolate this result, recreate the catalog session and repopulate the relevant hierarchy.
- resolve objects by stable identifiers rather than display names.
- compare pending values with collection property metadata.
- The next diagnostic action is to save the smallest coherent change set and inspect ErrorInfo.
- To isolate it, verify the committed object by repopulating after SaveChanges.
Retry and recovery
Generate a new application GUID and preserve the existing class identity; do not delete a valid CLSID to reuse it.
Practical administration scenario
A deployment template accidentally reuses a component CLSID as the new application AppID.
Difference from nearby COMADMIN results
COMADMIN_E_APPLICATIONEXISTS reports an existing application, while this code reports a cross-kind GUID collision.
Official Microsoft references
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