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E_SYNCENGINE_UNSUPPORTED_REPARSE_POINT
The scope of E_SYNCENGINE_UNSUPPORTED_REPARSE_POINT is Windows cloud-file and sync-engine infrastructure: the sync tree contains a reparse point whose semantics the engine does not support. Preserve 0x8802D009 beside the returning call before cleanup or retry creates a more generic secondary failure.
Wrong turns
When it is returned, Cloud Files itself uses controlled reparse points; this code concerns a tag or topology the engine does not support.
Do not delete every reparse point or assume it is a symbolic link.
Object and state boundary
When it is returned, a Windows sync engine coordinates local NTFS objects, provider metadata, remote identifiers, quota and naming rules, placeholder hydration, network authentication, and asynchronous upload or download state. During a this result investigation, the same Explorer action can cross several of those boundaries, so diagnosis must retain the first failing stage rather than treating every code as a generic connectivity problem.
During a this result investigation, reparse points are a mechanism, not a single object type. Junctions, symbolic links, mount points and provider placeholders have different tags and traversal rules; following them blindly can escape the sync root or create cycles.
The first owner to inspect is the local sync root, placeholder state, file-system operation, provider request, network exchange, account policy, or remote storage operation that produced the HRESULT.
Capture before retry
| Capture | Diagnostic value |
|---|---|
| Reparse tag and attributes for it. | This separates caller input from environment and service state and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Source and resolved target for it. | This provides a stable comparison across retries or another machine and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Position relative to sync root for it. | This identifies the exact object or resource generation involved and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Provider placeholder state for it. | This places the failure on the lifecycle or transaction timeline and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
Controlled comparisons
| Control | Interpretation | Hold constant |
|---|---|---|
| Same input, fresh object or connection | If the result disappears, retained lifecycle or ownership state is implicated. | While diagnosing this result, keep the original data, account, device, or timeline parameters unchanged. |
| Same object, reduced operation | If the result follows one specific transition, statement, file, or ceremony step, the failure is localized. | While diagnosing this result, remove only unrelated work and keep the first failing boundary visible. |
| Same stable item ID, second supported path | A change separates local file-system/provider state from remote service state. | While diagnosing it, keep account, remote version and client build fixed. |
Step-by-step investigation
The investigation should change one variable at a time and keep the original failing sample.
- First: Inspect the tag without traversing first.
- Next: Distinguish Cloud Files placeholders from links.
- Then: Reject escapes and cycles.
- Finally: Replace unsupported topology with ordinary supported directories.
Closure criteria
Closure for it requires supported placeholders synchronize, while unsupported links are detected before traversal and explained precisely; then repeat the next lifecycle operation to detect stale state.
Technical references
The references below define the API family or storage/protocol behavior used to interpret it.
- Microsoft: Build a Cloud Files sync engine
- Microsoft: Restrictions and limitations in OneDrive and SharePoint
- Microsoft: Reparse points
- Microsoft: Cloud Filter API reference
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