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Table of contents
Symptom & Impact
dnf update and dnf makecache hang or fail with Curl error 28, causing delayed patching windows and stale package metadata across RHEL 8 hosts.
Environment & Reproduction
On RHEL 8.8 and 8.10 with intermittent WAN latency, run dnf clean all && dnf makecache and observe frequent timeout or repomd.xml download failures.
Root Cause Analysis
The active mirror list selects slow endpoints, and proxy or DNS latency amplifies request retries, so dnf cannot complete metadata refresh in time.
Quick Triage
Check name resolution and route stability, then test repo reachability with curl and review recent package-manager events using journalctl -u dnf-makecache.
Step-by-Step Diagnosis
Run dnf repolist -v, inspect baseurl and metalink settings, verify subscription status, and read /var/log/dnf.log plus journalctl for repeated timeout signatures.
Solution – Primary Fix
Pin reliable baseurl entries, increase timeout and retries in /etc/dnf/dnf.conf, run dnf clean all, then validate with dnf makecache and a full dnf update.
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Solution – Alternative Approaches
Use a local caching proxy, configure Satellite mirrors, or schedule retries during low-traffic windows to reduce mirror-selection instability.
Verification & Acceptance Criteria
dnf makecache completes without errors, dnf update lists packages normally, and no timeout bursts appear in journalctl or dnf logs for 24 hours.
Rollback Plan
Restore original repo files from backup, revert dnf.conf timeout changes, clear cache again, and re-test the previous behavior to isolate config regressions.
Prevention & Hardening
Maintain internal mirrors, monitor repo latency, keep firewalld egress rules explicit, and document dnf proxy standards in baseline host configuration.
Related Errors & Cross-Refs
Compare with subscription-manager repo disabled issues and certificate validation failures that also surface as dnf metadata download problems on RHEL 8.
Related tutorial: View the step-by-step tutorial for rhel-8.
View all rhel-8 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Review Red Hat dnf and subscription-manager guidance, mirror best practices, and enterprise patch management runbooks for RHEL 8 estates.
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