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The Default VPC Security group only allows access from its self. You will need to update the appriopiate security group to allow inbound traffic to the port in question from the CIDR you require.
If you could share more details about your security groups etc, this would help
Thanks
Please use the VPC Reachability Analyzer to troubleshoot this issue.
For some reason we can't seem to get that working. It gives me an access denied.
Default VPC sg is Literally Default VPC sg. AWS best practice is make custom sg for each workload environment and required policy. When you make sg with right policy for your situation (for example allow specific source IP/Any IP with specific destination service port to reach your instances)than put this on your instance.
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That was what confused me. I thought that the default security policy already allowed traffic in. Everyone shows EC2 instance creation, but it wasn't clear to me how that Security Group worked. That was definitely my issue. Thank you for the help.