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Hi Denis,
It is expected that you would not be able to reach instance over its public IP with default settings.
default security group associated to the instance, allow inbound traffic from network interfaces (and their associated instances) that are assigned to the same security group.
[+]: https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html#DefaultSecurityGroup
Therefore, to access instance over its public IP from your source machine, please add inbound rules to the security group.
To access windows instances:
[+]: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/authorizing-access-to-an-instance.html#add-rule-authorize-access
To access linux instances:
[+]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html#add-rule-authorize-access
I hope this helps.
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