The mock network interface returns a NetworkTimeout error code on timeout running a command whereas the real network interface seems to return NetworkInterfaceExceededTimeLimit. They seem to mean different things and are handled differently (e.g. NetworkTimeout is considered a retryable error, at least by this list, whereas NetworkInterfaceExceededTimeLimit is not). I think the network interface mock should be fixed to return NetworkInterfaceExceededTimeLimit in the correct scenarios.