In network configurations where gateway Brokers are separated by a firewall, the firewall may terminate a connection if the connection remains idle for a long period of time. To prevent this from occurring between gateway Brokers, you can use the BrokerAdminClient.setClusterGatewayKeepAlive method. This method causes a gateway Broker to periodically issue "keep-alive" messages to the other Broker, preventing the connection between them from remaining idle too long.