After careful consideration, we have made the decision to close new customer access to **AWS Mainframe Modernization self-managed experience**, effective July 30, 2026. Existing customers can continue to use the service as normal. AWS continues to invest in security and availability improvements for AWS Mainframe Modernization self-managed experience, but we do not plan to introduce new features. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 

**AWS Mainframe Modernization Service (Managed Runtime Environment experience)** is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 

# Restart an AWS Mainframe Modernization runtime environment
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Use the AWS Mainframe Modernization console to restart an AWS Mainframe Modernization runtime environment. When you restart a runtime environment, the billing for the environment will be resumed. 

## Restart a runtime environment
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To restart an AWS Mainframe Modernization runtime environment, you follow similar steps as the stop environment section.

**To restart a runtime environment**

1. Open the AWS Mainframe Modernization console at [https://console.aws.amazon.com/m2/](https://console.aws.amazon.com/m2/).

1. In the AWS Region selector, choose the Region where the environment that you want to restart was created.

1. On the **Environments** page, choose the environment that you want to restart.

1. On the details page for the environment, choose **Actions**, and then choose **Edit environment**.
**Note**  
The desired capacity for standalone environment can only be updated to 1. To restart a runtime environment, you can only choose to restart immediately. 

1. On the **Edit environment page**, find **Resources section**, and update the desired capacity from zero to the required capacity.

1. Choose **Next**.

1. In **When to apply these changes**, choose **Immediately**. Then choose **Update environment**.

You see a message when the environment capacity is updated and the environment is restarted.