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FRS_ERR_PARENT_TO_CHILD_COMM
The file replication service on the domain controller cannot communicate with the file replication service on this computer. The event log may have more information.
FRS_ERR_PARENT_TO_CHILD_COMM is Win32 error 8012 (0x00001F4C) and concerns legacy FRS communication from a parent domain controller toward the child/member.
What to verify
Verify whether the parent FRS service can contact the child endpoint and receive a valid response. Check parent and child addresses, inbound firewall decisions on the child, and child NtFrs state.
Likely causes
- inbound RPC to the child is blocked.
- the child service is stopped.
- DNS for the child is stale.
- network address translation or endpoint security prevents callbacks.
Troubleshooting steps
- Collect parent and child addresses.
- Record inbound firewall decisions on the child.
- Correlate child NtFrs state 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
Restore the child endpoint and inbound path, correct DNS, and verify parent-initiated RPC rather than assuming bidirectional connectivity from a successful child request.
Related errors
FRS_ERR_CHILD_TO_PARENT_COMM identifies the opposite direction
Example
Replication setup succeeds from the child console, but the parent cannot call back through a host firewall. Allowing the required authenticated RPC path resolves the directional failure.
References
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