autodefinedReverseFlag

Indicates whether or not the Resolver will create autodefined rules for reverse DNS lookups. This is enabled by default. Disabling this option will also affect EC2-Classic instances using ClassicLink. For more information, see ClassicLink in the Amazon EC2 guide.

We are retiring EC2-Classic on August 15, 2022. We recommend that you migrate from EC2-Classic to a VPC. For more information, see Migrate from EC2-Classic to a VPC in the Amazon EC2 guide and the blog EC2-Classic Networking is Retiring – Here’s How to Prepare.

It can take some time for the status change to be completed.