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Here are the docs on how to connect to Neptune using Bolt in Python against a Neptune cluster that is configured to use IAM Authentication: https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-opencypher-bolt.html#access-graph-opencypher-bolt-python-iam-auth.
You'll need IAM credentials that provide access to Neptune's data plane: https://docs.aws.amazon.com/neptune/latest/userguide/iam-data-access-policies.html
Ensure that you are connecting to Neptune from inside the same VPC where Neptune is hosted, as Neptune is not accessible outside of it's hosting VPC.
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