Upgrade to 9.4
After upgrade this error is observed in ssg_0_0.log
2020-09-19T10:54:12.270-0500 WARNING 1 com.l7tech.server.boot.GatewayMain: Error starting server : Lifecycle error: Could not initialize Hazelcast cluster
com.l7tech.server.LifecycleException: Lifecycle error: Could not initialize Hazelcast cluster
Release : 7.1
Component : MOBILE API
Upgraded AND restart/reboot all nodes in the cluster so hazelcast is operating at the same version (internally) mismatch of versions 9.3 nodes in cluster with 9.4 restarted will cause exceptions and failures to start the gateway.