ipsec.1
. The response includes information that you need to give to your network administrator to configure your customer gateway.
We strongly recommend that you use HTTPS when calling this operation because the response contains sensitive cryptographic information for configuring your customer gateway.
If you decide to shut down your VPN connection for any reason and later create a new VPN connection, you must reconfigure your customer gateway with the new information returned from this call.
This is an idempotent operation. If you perform the operation more than once, Amazon EC2 doesn't return an error.
For more information about VPN connections, see Adding a Hardware Virtual Private Gateway to Your VPC in the Amazon Virtual Private Cloud User Guide.