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My SGs on my instances are completely wide open. Do I even need NAT Gateways?
answered a year ago
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Have you checked the NACLs also as mentioned here
Also what TCP/UDP port your application is running on? Perhaps check if that application is running, for example if the target is a Linux instance run netstat -an | grep <Port number>
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Hi - I think a similar discussions and pointers here may help you. https://repost.aws/questions/QUuueXAi20QuisbkOhinnbzQ/aws-nlb-security-group
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You would need NAT gateways only if you need connectivity to the internet from instances in private subnets.