Cannot SSH into EC2 instance after systemctl command

Question

After executing some systemctl commands on our EC2 instance yesterday, the terminal froze and now we are unable to SSH back into the server.  The API service we were hosting on this website is also down, and we'd like some assistance getting everything up and running again.  I did try a few obvious things, name turning the system off and on again, as well as leaving it off overnight and restarting it in the morning.  Still, no luck.  Please let us know what can be done.

Answer

Hey – To help narrow the scope of your issue could you provide the error or what happens when you try to SSH? Does it timeout? 
 
A few other questions / comments: 
 
Have you tried instance connect via the Console? 
 
Verify the current IP Address of the instance (assuming an elastic/static IP is not assigned). 
 
If you have snapshot or backup of the instance try launching a new instance in the same subnet and test for connection. 
 
If possible, try from another local network or source. 
 
Verify security group and ACL rules. 
 
Verify that nothing has changed with the route table or internet gateway. 
 
Verify the key pair being used. 
 
https://repost.aws/knowledge-center/ec2-linux-ssh-troubleshooting
 
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-console.html
 
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html

Cannot SSH into EC2 instance after systemctl command

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