There are two checks on EC2, explain what they do

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Sigiloso · Accepted Answer

I know there are two checks in there, they are reachability  checks, I don't remember exactly what they do, but if one them fails you would probably lose ssh connectivity to the instances (I knew because it happened quite a few times)

Sigiloso · Answer

2 initial status checks. 1 checks the OS health and the other checks the hardware health.
AWS's solution for the hardware check failed status is to reboot the instance; that way it will start on a different healthy hardware. 
As for the OS status check, the first action would be rebooting the instance, and if the problem presisted, you can restore the most recent AMI before the OS crashed.

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