What is a Cassandra contact point and how is it configured in the Gateway Implementation?
The gateway implementation of cassandra uses an underlying library from datastax,
The verbiage of this in the gateway documentation represents that of datastax which describes a contact point as,
Contact points are addresses of Cassandra nodes that the driver uses to discover the cluster topology.
For more details you can review the datastax documentation,
https://docs.datastax.com/en/drivers/java/3.6/com/datastax/driver/core/Cluster.Builder.html#addContactPoint-java.lang.String-
Also for further debugging you can enable debug as,
log.levels cluster property: com.datastax.driver.core.level = FINE
And ensure the log sink contains a level of ALL or FINE and above for datastax messages.