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Certainly, here are some steps to troubleshoot the 404 error on AWS EC2:

  1. Check the application logs: One of the most common reasons for a 404 error is a wrong URL or the page not existing. Check the application logs to figure out if that's the case.

  2. Check the server logs: 404 errors can also be caused by server misconfigurations, such as incorrect permissions or file locations. Check the server logs to see if there are any errors.

  3. Check the firewall: If you're using a firewall, make sure that it's configured to allow traffic. You can check the firewall logs to see if there are any issues.

  4. Check the DNS: If the domain name is not resolving properly, that could be causing the 404 error. Check the DNS to see if it's set up correctly.

  5. Check the web server configuration: Make sure that the web server is properly configured to handle the application. This can often be the cause of 404 errors.

If none of these steps help you solve the problem, you may need to contact AWS support for additional assistance.