Cannot connect to server even after reboot UPSTREAM_NOT_FOUND [519]

Question

Our company website crashed which runs on a bitnami ubuntu instance in lightsail

I did a sudo reboot

Now I can't even ssh into it.

I get

```
An error has occured and we were unable ... 
UPSTREAM_NOT_FOUND [519]
```
I took a snapshot (yes should have done before error 😢) and spun up a new instance.  Can't ssh into it either.

I can't emphasis enough how bad a time it is for our website to go down.
Anyone know how I can access it again?

Edit: Just wondering is there any way to get support on this issue?  Can AWS inject a new port or something similar to enable access?

Second Edit: The website is now back up running (maybe something in the crontab).  I can login into wordpress can still cannot ssh into the server.  This is really bizarre.  Any help would be really appreciated here.

Third edit:  tried AWS Systems manager as per https://aws.amazon.com/premiumsupport/knowledge-center/add-lightsail-to-systems-manager/
Sadly, there seems to be no diagnostics in lightsail.  I enter the three codes and the instance launched but when I check fleet manager there is nothing.  😢

Answer

Take that snapshot from the production instance that you created earlier and create a new volume and attach it to a running troubleshooting instance that you have access to. Mount the volume to the OS and then start looking through the logs to find the root cause.

Once you find the root cause, stop the production instance, detach the volume, attach it to the troubleshooting instance, fix the issue, detach from troubleshooting instance, attach back to prod instance, and start production instance.

Consider using Sessions Manager to connect to the instance in the future.

Cannot connect to server even after reboot UPSTREAM_NOT_FOUND [519]

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