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I guess.... however it is a guess.... is that ec2-xx-xx-xx-xx.us-east-1.compute.amazonaws.com is bound to your server and will not change after a reboot....
-xx-xx-xx-xx- is most likely a unique value bound to your server, so it should be fine. Please do inform us if this is the case. I am interested in your results.
ec2-xx-xx-xx-xx.us-east-1.compute.amazonaws.com changes every time i reboot, so my listener goes down and i have to register database to new listener every time i bring server up.
Your public DNS should only change if you have shut down the AMI. In my experience a reboot will not cause it to change. You can bypass this issue by adding an entry to the /etc/hosts file and changing the tnsnames.ora and listener.ora files to reflect this.