To connect to an instance via SSH, you must:
Step 1: Assign a floating IP to the instance by navigating to Action → Associate Floating IP
If you see “No floating IP addresses allocated”, click the + button to allocate an IP:
Ensure the the Port to be associated is a port on the local network. I.E. the port must be on the 172.16.1.x subnet
Click “Associate”
Step 2: Ensure that an appropriate security group is applied
Select the ssh_ping security group and click Save
The default security group will block incoming traffic on all ports.
The ssh_ping security group will allow ssh access and ping traffic
See Security Groups for more information
You should now be able to ping the floating IP address associated with this instance
Note: You will not be able to SSH into most instances without adding an SSH Key at launch or manually adding an SSH key in the OS. Cloud images disable password authentication over SSH and require the usage of SSH keys