If a privileged account's permissions are accidentally revoked, you can reset them and set a new password to restore normal operation.
Procedure
Warning
The privileged account is a management account used by the control system. You must not change the password for the privileged account in any unauthorized interface or environment.
Go to the Instances page. In the top navigation bar, select the region in which the RDS instance resides. Then, find the RDS instance and click the ID of the instance.
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In the left-side navigation pane, click Accounts.
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For the Privileged Account, click Reset Account Permissions.
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Enter a new password and click OK.