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The correct method of accessing a private docker registry within a docker container while connected to a VPN is as follows:

1. Connect to the VPN from within the docker container.
2. Add the IP of the private docker registry to the docker daemon's insecure registry list.
3. Restart the docker daemon.
4. Authenticate to the private docker registry using the appropriate credentials.
5. Pull or push the desired image from or to the private docker registry.

Note: In order to avoid exposing the insecure registry list, it is recommended to use a secure registry or a VPN connection with proper security measures in place.