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ERROR_NET_WRITE_FAULT
A network redirector accepts local file writes, sends the required remote operation, and returns the server or transport result to the application. A write fault therefore belongs to the data-transfer/commit path, not merely to locating the share. In SMB, a disconnect can invalidate ordinary opens while durable or resilient handles follow specific reconnection rules.
Capture whether data was acknowledged before the failure and whether the application retries the write. Repeating a non-idempotent write without understanding the remote state can create duplicate or partially updated data. Also check server storage and server-side file errors; the Win32 network code does not prove that the client NIC caused the failure.
Write-path evidence
- Record file offset, write length, and whether buffered data was being flushed.
- Correlate with SMB disconnect/reconnect and the lifetime of the file handle.
- Inspect the server-side storage and file-system status for the same operation.
- Determine whether retry is safe before automatically resubmitting the write.
Windows network redirector architecture · MS-SMB2 network disconnect handling · Samba smbclient manual
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