Typically, this occurs because a Gateway database node's local MySQL server was terminated after the Gateway was initialized. For example: Gateway 1 is started successfully and is able to process traffic. Gateway 1's MySQL server is then terminated forcefully by an operator. Gateway 1 will then begin recording the error messages logged above. In a normal operating environment, a single Gateway database node running without failover or replication will cease processing traffic. In order to maintain continuity of service, the Gateway is capable of failing over to a specific secondary Gateway database--typically present on an additional Gateway instance. This is considered clustering.