Unable to attach custom (Cloudflare) ssl certificate - "not issued by a trusted Certificate Authority"

Question

I have 3 subdomains in Cloudflare, in S3 buckets with static website hosting, attach the same certificate, but now is not permit to attach the certificate to a two new static website hosting in S3.

I need to verify anything? The five buckets are in same region, us-east-1.

![SSL certificate ](/media/postImages/original/IMjbfJFEHzR-6Oe-9rAvhCNg)

![The error is ](/media/postImages/original/IMJ5i1BIWJTAmhygcxz49smQ)

Riku_Kobayashi · Answer

Hello.

I searched for the error message and found the following document:  
https://repost.aws/knowledge-center/cloudfront-invalid-viewer-certificate  
> This error message indicates that the certificate wasn't issued by a trusted certificate authority (CA). Issue a certificate from a trusted CA for CloudFront to allow you to use an alternate domain name (CNAME). If your current CA doesn't support this, you can use ACM to issue a free valid certificate.  
> 
> Note: Self-signed certificates aren't supported.

Are you using a certificate issued by ACM?

Unable to attach custom (Cloudflare) ssl certificate - "not issued by a trusted Certificate Authority"

Relevant content