The first things I'd check are:
- Is the web server running okay? Can you connect to port 80/443 on the loopback address while SSH'd in?
- Security Groups, are you sure the right ports, protocols and IP ranges are in place?
There are also some troubleshooting steps you can review here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html
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