The access node must have access to the global and regional STS endpoints.
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Global STS endpoints: The global STS endpoint is https://sts.amazonaws.com.
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Regional STS endpoints: For example, for instances in a Region called us-east-1, the endpoint is https://sts.us-east-1.amazonaws.com.
Related Topics
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For more information about AWS service endpoints, see AWS service endpoints on the AWS documentation site.
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For more information about STS endpoints and quotas, see AWS Security Token Service endpoints and quotas on the AWS documentation site.