My AWS Instance suddenly became completely unresponsive

Question

Hello All,  
  
I was in the middle of performing some actions on my server (Ubuntu 20.04 - had run bundler install for a rails app). In the middle of querying the gem server, it hung and then since then I cannot connect to the server. The status checks all say things are good, the monitoring shows the server went to 100%.  
  
After about 10 minutes I shut down the server via the console and then restarted. I still cannot access it (via ssh using the public IP address). In addition, I tried access via ssh using the private IP address from another AWS instance (in the same availability zone). No matter what I try I cannot gain access to the machine again. I have restarted (stopped and started) twice and it hasn't helped. The monitoring shows that the cpu usage is normal now after restarting and the network monitoring also shows _something_ going in and out despite the fact that I cannot connect.  
  
Can some one help with this? The instance id is: **i-05afe6ed27ef2eb98**  
  
Thanks,  
Scott Little

Answer

Doh, after the start and restart I had forgotten to change the dns record to point to the new IP address. I am not sure why my test pointing to the private ip didn't work though, I guess that those are more private than I thought - not accessible from aws machines in the same zone.  
  
Anyway, never mind and sorry for the noise.

My AWS Instance suddenly became completely unresponsive

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