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hrCommunicationError
Why this result matters
hrCommunicationError means the local backup protocol failed after the operation began exchanging control or file data.
The stored value is 0xC7FF000D (facility-specific HRESULT). The legacy symbolic name comes from the Windows Directory Service backup/restore message header.
The first useful distinction is that hrCouldNotConnect is normally an establishment failure; this result indicates a communication breakdown during the local workflow. Start by capturing the failing API, bytes transferred, RPC and Win32 status, service events, HBC state, and last successfully closed file.
Do not confuse it with
This result specifically means that hrCouldNotConnect is normally an establishment failure; it indicates a communication breakdown during the local workflow. Related values below can appear in the same workflow but require a different response:
hrCouldNotConnect | the backup client could not establish the required session with the selected server or running Directory Service |
|---|---|
hrBFPageNotFound | the requested page was not present in the buffer-manager context used by the operation |
hrRestoreMapExists | a restore map is already registered for the component while the caller attempts to add another mapping |
Forensic checklist
- Code-specific observation: capture the failing API, bytes transferred, RPC and Win32 status, service events, HBC state, and last successfully closed file.
Objects and state involved
| Diagnostic layer | Directory Service state, RPC connectivity, authentication, and the HBC transport |
|---|---|
| Relevant API surface | DsIsNTDSOnline, DsSetAuthIdentity, DsBackupPrepare, and subsequent file transfer calls |
| Code-specific condition | the local backup protocol failed after the operation began exchanging control or file data |
| Narrow corrective direction | abort the context, correct the transport or service fault, and restart the backup so file boundaries are unambiguous |
The legacy API requires the directory service to be running for backup and offline for restore. Transport failure can invalidate the context and make partial file data unusable as a set.
Actions that can make diagnosis worse
- Do not resume in the middle of a file without a protocol guarantee.
- Do not report a connectivity problem as database corruption.
Validation after correction
- Record it,
0xC7FF000D, the API name, the current phase, and all live context or file owners. - Verify the condition by capturing the failing API, bytes transferred, RPC and Win32 status, service events, HBC state, and last successfully closed file.
- Apply only the targeted fix: abort the context, correct the transport or service fault, and restart the backup so file boundaries are unambiguous.
Acceptance criteria for a fix
A useful regression test should force the condition “the local backup protocol failed after the operation began exchanging control or file data”, call one documented API transition, and assert the exact HRESULT.
Technical references
- AD backup walkthrough — API ordering, file semantics, warning/error interpretation, or recovery behavior relevant to this HRESULT.
- DsBackupPrepare contract
- AD backup errors
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