Sometimes the subscription to market data starts successfully and product definitions are received. However, no order books updates are reported by the Handler, and there are no notifications about changes in markets state. In most cases, this happens because there are no multicast messages from the Multicast Price Feed. To verify this, subscribe to the error event (see Event Listeners for more information). If errors with code equal to KnownWarnings::NoNetworkActivity are reported periodically (usually with reason "There's no activity on feed within `N` seconds"), then the assumption is valid. In such a case network settings must be verified. Please read Multicast Test Program for more details.
