Create a VPC endpoint for Amazon STS - Amazon Identity and Access Management
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Create a VPC endpoint for Amazon STS

To start using Amazon STS with your VPC, create an interface VPC endpoint for Amazon STS. For more information, see Access an Amazon service using an interface VPC endpoint in the Amazon VPC User Guide.

After you create the VPC endpoint, you must use the matching regional endpoint to send your Amazon STS requests. Amazon STS recommends that you use both the setRegion and setEndpoint methods to make calls to a Regional endpoint. You can use the setRegion method alone for manually enabled Regions, such as Asia Pacific (Hong Kong). In this case, the calls are directed to the STS Regional endpoint. To learn how to manually enable a Region, see Managing Amazon Regions in the Amazon Web Services General Reference. If you use the setRegion method alone for Regions enabled by default, the calls are directed to the global endpoint of https://sts.amazonaws.com.

When you use regional endpoints, Amazon STS calls other Amazon services using either public endpoints or private interface VPC endpoints, whichever are in use. For example, assume that you have created an interface VPC endpoint for Amazon STS and have already requested temporary credentials from Amazon STS from resources that are located in your VPC. In that case, these credentials begin flowing through the interface VPC endpoint by default. For more information about making Regional requests using Amazon STS, see Manage Amazon STS in an Amazon Web Services Region.