CSS Files Randomly Returning 403 Forbidden (EC2 + CloudFront + S3 Setup)

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  menakasparx · Member · Jul 7, 2025 at 7:19 am

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  Hi all,

  I’m facing a recurring issue with my WordPress site, which is hosted on an EC2 instance and configured with CloudFront and S3.

  At random intervals, some CSS files return a 403 Forbidden error, causing parts of the webpage to break. When I log into the WordPress admin dashboard and update or save the page (without changing anything significant), the CSS file becomes accessible again, and the page displays correctly. It seems like the CSS file is being “regenerated” at that point in server.

  Has anyone encountered a similar issue? Why would these CSS files intermittently become forbidden, and what could be causing this behavior? Could it be related to CloudFront caching, S3 permissions, or something else in the WordPress setup?

  Would appreciate any insights or solutions to prevent this from happening.

  Thanks in advance!