In newly launched instances, all inbound flows are blocked by default for security, and for this reason, instances do not respond to connection requests such as ping, telnet, or ssh. If you try to connect using SSH, the following error message is returned:
ssh: connect to host xxx.xx.xx.xxx
port 22: Operation timed out.
To access the instance, you thus need to add a rule to its security groups to authorize the connection. For more information, see Accessing Your Instances.
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