The developer has ensured that the public API is accessible, but the Lambda function cannot connect to the APIHow should the developer fix the connection issue?
Ensure that the network ACL allows outbound traffic to the public internet.
Ensure that the security group allows outbound traffic to the public internet.
Ensure that outbound traffic from the private subnet is routed to a public NAT gateway.
Ensure that outbound traffic from the private subnet is routed to a new internet gateway.
Explanations:
The default network ACL allows all outbound traffic. Therefore, unless it has been modified, it should not block traffic to the public internet. Ensuring that the network ACL allows outbound traffic is unnecessary in this case.
The default security group allows all outbound traffic. If the Lambda function is in this default security group, it will already be permitted to make outbound requests to the public internet, making this option irrelevant unless specific outbound rules are set.
Since the Lambda function is running in a private subnet, it cannot access the internet directly. A NAT gateway is required to route outbound traffic from the private subnet to the public internet. This is the correct solution to allow the Lambda function to connect to public APIs.
A NAT gateway is needed for a private subnet to access the internet. An internet gateway only allows direct access for resources in public subnets. Routing outbound traffic from the private subnet to an internet gateway would not work as intended.
I have a feeling that the answer is:
Ensure that outbound traffic from the private subnet is routed to a public NAT gateway.