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I have an AWS REST API hosted in AWS Account A, which is accessible from AWS Account B. I need to block access only for a specific EC2 instance in Account B, while ensuring that the API remains accessible from other sources.

What I’ve Tried So Far:

AWS WAF: Applied rules but couldn't effectively block the requests. ALB Rule (Timeout Response): Did not work as expected. Security Group Changes: Had no impact on restricting API access for just this server. NACLs: Blocks traffic for all instances but I need to target only one EC2.

Key Constraints which are making me stuck are: ✅ The API and server configuration in Account B cannot be changed. ✅ The API should remain accessible for other servers. ✅ Security groups in Account B cannot be updated.

Any suggestion would be helpful.

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