# Scheduling a recurring scan for unmanaged EC2 instances
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You can run an on-demand scan for Amazon EC2 instances in your account or organization that Systems Manager can't manage due to configuration issues. You can also schedule this scan to occur automatically on a regular schedule.

**To schedule a recurring scan for unmanaged EC2 instances**

1. Open the Amazon Systems Manager console at [https://console.amazonaws.cn/systems-manager/](https://console.amazonaws.cn/systems-manager/).

1. In the navigation pane, choose **Diagnose and remediate**.

1. Choose the **Unmanaged EC2 instances issue** tab.

1. In the **Diagnose unmanaged EC2 instances** section, turn on **Schedule recurring diagnosis**.

1. For **Diagnostic frequency**, select whether to run the diagnosis once a day or once a week.

1. (Optional) For **Start time**, enter a time, in 24-hour format, for the diagnosis to begin. For example, for 8:15 PM, enter **20:15**.

   The time you enter is for your current local time zone.

   If you don't specify a time, the diagnostic scan runs immediately. Systems Manager also schedules the scan to run in the future at the current time. If you specify a time, Systems Manager waits to run the diagnostic scan at the specified time.

1. Choose **Execute**. The diagnosis runs immediately, but will also run on the schedule you have specified.