How can we figure out when a service is unable to connected to another service due to VPC or similar issues ?

Question

I am trying to connect Lambda function to a Dynamodb table, but the service times out.

`Task timed out after 300 seconds`
One thing is, the Cloudwatch logs do not say anything about whether there was an endpoint missing or a Security Group is not allowing Inbound/Outbound rules and so on.

How to figure out if a problem is related to Internet/VPC connectivity ?

Answer

For the most part, timeout is due to network issue. Does the entire network connectivity look good?
https://repost.aws/knowledge-center/lambda-vpc-troubleshoot-timeout

How can we figure out when a service is unable to connected to another service due to VPC or similar issues ?

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