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Hi,
It is important to confirm that there really was no change in the security group, but it is quite valid to assess the NACL where this EC2 resides "https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html “, check the status of the EC2, that is, whether the EC2 is running.
If all settings are correct and EC2 is running, you can try using the Session Manager service "https://docs.aws.amazon.com/systems-manager/latest/userguide/session-manager-getting-started.html “, with Session Manager, you can manage EC2 instances. Use an interactive browser-based shell or the AWS Command Line Interface (AWS CLI). Session Manager provides secure and auditable node management without the need to open gateways, maintain bastion hosts, or manage SSH keys.
Best Regards,
Marcelo Oliveira
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What is the status of your EC2, is it Running or Stopped/Terminated?
Also I guess you meant HTTP instead of HTML?
Do you have console access to the account that has the EC2 instance you are working with? If so, EC2 Console may be an option.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-methods.html#ec2-instance-connect-connecting-console