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From your description, the service is down suddenly. I suppose you didn't change any EC2 configuration like SecurityGroup or NetworkACL.
- I suggest you can check the health status of your instance first.
- Do the self service check via look back IP address.
(A) ssh Login to your instance.
(B) Enter command:
curl -v 127.0.0.1
andcurl -v -k https://127.0.0.1
to confirm if your web service(Nginx/Apache) is able to response a http response.
If you encounter obstacles in these two places, the possible reasons are various issues within the OS. It is recommended that you seek further assistance from Linux/Windows experts based on the test results.
answered 3 months ago
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Did you fix this, your site seems to be responding as expected right now?