AWS CloudFront CNAME Conflict – “One or more of the CNAMEs you provided are already associated with a different resource”

Siddharth Ajith — Thu, 03 Apr 2025 03:32:34 +0000

I am trying to create a new CloudFront distribution and associate the alternate domain name app.example.com with it. Additionally, I have a valid ACM SSL certificate issued for app.example.com in N.Virginia.

However, when I attempt to save the CloudFront distribution, I receive the following error:

"One or more of the CNAMEs you provided are already associated with a different resource."

Troubleshooting Steps Taken:

Checked existing CloudFront distributions using the command:

_aws cloudfront list-distributions --query "DistributionList.Items[*].{Id:Id,Aliases:Aliases.Items}" --output json_

app.example.com is not listed in any of the CloudFront distributions.
Checked for deleted CloudFront distributions (in case the CNAME was retained):

_aws cloudfront list-distributions --include-deleted --query "DistributionList.Items[*].{Id:Id,Aliases:Aliases.Items}" --output json_

The domain did not appear in deleted distributions either.
Checked Route 53 records:

app.example.com currently has:
- An A record pointing to an internal ALB.
- A CNAME for ACM certificate validation (which should not cause conflicts).

Has anyone faced a similar issue before?

DEV Community: Siddharth Ajith

AWS CloudFront CNAME Conflict – “One or more of the CNAMEs you provided are already associated with a different resource”

Troubleshooting Steps Taken: