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FRS_ERR_INVALID_API_SEQUENCE
The file replication service API was called incorrectly.
FRS_ERR_INVALID_API_SEQUENCE is Win32 error 8001 (0x00001F41) and concerns the order of legacy File Replication Service management calls.
What to verify
Verify whether the FRS API request follows the lifecycle and sequencing contract expected by the service. Check API name and ordered call trace, context or replica-set identifier, and service state at each call.
Likely causes
- a close or commit call arrived before initialization.
- the caller reused a context after completion.
- an operation was invoked twice.
- management state changed between calls.
Troubleshooting steps
- Collect API name and ordered call trace.
- Record context or replica-set identifier.
- Correlate service state at each call with the File Replication Service event log, Service Control Manager, Directory Service and Netlogon events, RPC diagnostics, and replica-set state.
Handling, retry, and recovery
Restart the management sequence from a fresh context and fix the caller ordering rather than retrying the rejected call in isolation.
Related errors
FRS_ERR_INVALID_SERVICE_PARAMETER reports a bad value; this code reports a bad call order
Example
A migration helper invokes the finalization call twice after a timeout. Recording the first successful completion shows that the second call is invalid, so the helper is made idempotent.
References
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