At the time of Failover, all the active gateways can not connect to Failover Node.
ssg log would show the below errors
WARNING 156 com.l7tech.server.jdbc.JdbcQueryingManagerImpl: Failed to perform querying since Connection is read-only. Queries leading to data modification are not allowed
You can specify failover in the JDBC connection. For example;
You will also need to make sure that the necessary MySQL grants are in place to allow all Gateway nodes to access the OTK DB in MySQL