i inadvertently changed ip address of amazon ec2 t2.micro instance. result, i'm unable ssh system. i've rebooted multiple times via aws console, no avail. i've updated associated security group accept incoming traffic on ports. still no luck. there way check see if system running? can't useful information out of 'detailed monitoring' screen aws provides...
my problem stemmed fact had set network access control list (acl). had specified port 22 ingress (inbound) port did not include port 22 outbound (egress) port. resetting acl inbound/outbound rules fixed issue.
here article describing various security levels on aws:
http://docs.aws.amazon.com/amazonvpc/latest/userguide/vpc_security.html
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