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Hello.
For example, if the IP address is not allowed in the EC2 security group or subnet network ACL, it will be blocked.
Also, if you are using ALB etc. and have configured AWS WAF to block IP addresses, it will also be blocked.
I have never heard of AWS automatically blocking something even though nothing is configured.
It is possible that AWS is blocking it internally, but in that case, there is nothing the user can do about it, so I think you will need to open a case with AWS Support under "Account and billing".
Inquiries under "Account and billing" can be made free of charge.
https://docs.aws.amazon.com/awssupport/latest/user/case-management.html
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