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Hello,
This type of error generally occurs when WAF or origin is blocking the request. Below are some suggested methods that can be used to troubleshoot 403 Error.
- If you have Restrict viewer access turned on for your CloudFront’s behavior configuration, then requests made without using signed cookies or URL result in a 403 error.
- CloudFront can't distinguish between an HTTP status code 403 that’s returned by your origin and one that's returned by AWS WAF when a request is blocked.
- Alternative CNAME is incorrectly configured.
- Check cloud trail event matching with the request ID to troubleshoot your specific environment.
Please refer to this (https://aws.amazon.com/premiumsupport/knowledge-center/cloudfront-troubleshoot-403-errors/) article for detailed steps.
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