[2021] Download_batchspec Client Error May 2026

Most CLIENT_ERROR instances in CodeBuild are network-related.

If using GitHub or Bitbucket, ensure your or OAuth connection is still valid and has not expired. 3. Optimize Source Downloads

If your network and permissions are correct but the build still fails, the source itself may be the issue. download_batchspec client error

Verify that your has the AmazonS3ReadOnlyAccess policy or a custom policy allowing s3:GetObject on the specific bucket containing your source.

The IAM role associated with the CodeBuild project may lack the s3:GetObject permission required to download the source artifact or the buildspec from its S3 bucket. Most CLIENT_ERROR instances in CodeBuild are network-related

For extremely large repositories, the download may time out before completion. This is often resolved by using a shallow clone ( git clone --depth 1 ). Step-by-Step Troubleshooting Guide 1. Verify Network and VPC Connectivity

Projects running in a VPC often fail if they are placed in a public subnet without an elastic IP or in a private subnet without a NAT Gateway to access the internet. Optimize Source Downloads If your network and permissions

Ensure the Security Group attached to your CodeBuild project allows all outbound traffic (CidrIp 0.0.0.0/0 ) or at least targets the necessary ports for your source provider.

If your CodeBuild project is configured to run inside a VPC, it must have an outbound rule (egress) that allows traffic to the internet or to the specific AWS services (like S3) where your source is stored.