AWS Neptune - Open Cypher Connectivity

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How to connect to AWS Neptune using bolt protocol? Followed https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-opencypher-bolt.html and couldn't succeed. What is AuthTokens.none() mean here?

Tried https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-opencypher-bolt.html Seeing exception org.neo4j.driver.exception.DatabaseException: "Unexpected server exception 'MissingAuthenticationTokenException'"

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