📖 ~1 min read
Table of contents
Symptom & Impact
Container image retrieval fails, blocking deployments and CI build pipelines.
Environment & Reproduction
Seen with private registries using internal or rotated CA chains.
Root Cause Analysis
Registry certificate chain is untrusted by host CA store or Podman cert path.
Quick Triage
Confirm certificate issuer and trust anchor presence.
Step-by-Step Diagnosis
Verify full certificate chain and local trust installation state.
Solution – Primary Fix
Install trusted CA chain for registry and update host certificates.
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Solution – Alternative Approaches
Use temporary insecure registry config only for short-lived non-production testing.
Verification & Acceptance Criteria
Image pulls complete successfully with TLS verification enabled.
Rollback Plan
Remove added CA file if trust anchor is incorrect or compromised.
Prevention & Hardening
Track certificate expiration and automate trust distribution for private registries.
Related Errors & Cross-Refs
Related to x509: certificate signed by unknown authority and TLS handshake failures.
Related tutorial: View the step-by-step tutorial for Debian 13.
View all Debian 13 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Podman registry trust and Debian CA management documentation.
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