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Hi,
How are you accessing that public IP? I recommend you verify that the security group attached to the EC2 instance has rules allowing inbound internet traffic (0.0.0.0/0) for your ports and protocols, but also that the ACL associated with the instance's subnet has rules allowing both outbound and inbound traffic to the internet.
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I am accessing it through browser. I created the ec2 with most default settings
The default security group allows inbound traffic from all resources that are assigned to this security group, but not from the internet, so you ned to add a new inbound rule to authorize it. The rule configuration depends on the access you need (HTTP, HTTPS, SSH...), but the following Knowledge Center article describes step by step how to allow users to connect on HTTP (80) or HTTPS (443). On the other hand, the following EC2 documentation page explains how to add a rule for inbound SSH traffic. I hope this helps you.