Signed up for AWS free account and start familiar with EC2, completed the basic instance configuration, based on cases related to user security group (all pass way, don't make any restrictions), instance can enable normally,
But it cannot connect remotely the instance, tip

According to the prompt confirmation SSM agent is correct, confirm that IAM configuration is correct, but have been unable to visit EC2 instances, ping Eslatic IP address Settings, inaccessible, is it because the cause of the domestic firewall isolation? Who is a great god have the EC2 Settings the success and experience, on how to implement? Thank you very much,