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Hello.
Do you allow the required protocols in your security group's inbound rules?
For example, if you want to ping, you will need ICMP protocol.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/security-group-rules-reference.html#sg-rules-ping
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I accepted the answer because I didn't remember what rules I had set. I had already enabled all protocols (inbound). Now, I tried adding explicitly the ICMP inbound rule, but I don't ping. I have bound the elastic IP to the network interface. All ports enabled.