Troubleshooting Docker deployment failures with "unauthorized: authentication required" error

If you're experiencing deployment failures with the error message ERROR: Error response from daemon: unauthorized: authentication required , this issue can have multiple causes. Here's how to troubleshoot and resolve it: Check for Docker Hub service outages Before investigating configuration issues, first check if Docker Hub is experiencing downtime. Visit Docker Hub Status to see if there are any ongoing service disruptions that could be causing authentication failures. Verify AWS ECR authentication in your workflow If Docker Hub is operational, the issue is likely related to missing or expired AWS credentials. Ensure your GitHub workflow includes the proper AWS ECR authentication steps before any Docker build and push operations: name: CI/CD Pipeline on: push: branches:

• main jobs: build: runs-on: ubuntu-latest steps:

• name: Checkout code uses: actions/checkout@v3

• name: Duplo Setup uses: duplocloud/actions@main Check for expired secrets Even if your workflow was working previously, authentication secrets can expire unexpectedly. Verify that your GitHub repository secrets are still valid: Go to your GitHub repository Navigate to Settings → Secrets and Variables → Actions Check that the following secrets exist and are current: AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY Any DUPLO_* secrets if using Duplo for ECR authentication