📖 ~1 min read
Table of contents
Symptom & Impact
Service remains unreachable despite apparent correctness in host firewall and SELinux settings.
Environment & Reproduction
Local curl works, remote clients fail, and no obvious deny appears initially.
Root Cause Analysis
Binding only on localhost, wrong route, service dependency failure, or intermittent policy denies hidden in logs.
Quick Triage
Verify listen address, route tables, target interface, and recent service restart history.
Step-by-Step Diagnosis
Use ss -tulpn, ip route, systemctl status app service, firewall-cmd –list-all, ausearch, and journalctl -xe.
Solution – Primary Fix
Bind service to correct interface, restart with systemctl, confirm firewalld zone alignment, apply SELinux context corrections, and retest from remote hosts.
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Solution – Alternative Approaches
Remote probes succeed consistently and no fresh denials appear.
Verification & Acceptance Criteria
Revert recent network and service changes one at a time if regression appears.
Rollback Plan
Adopt layered runbooks covering service, firewalld, SELinux, and routing checks.
Prevention & Hardening
Implement synthetic remote checks after every yum update or service deployment.
Related Errors & Cross-Refs
Troubleshooting is fastest when systemctl, service wrappers, and journalctl are used together for context.
Related tutorial: View the step-by-step tutorial for rhel-7.
View all rhel-7 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Escalate when upstream load balancers, routes, or security appliances are implicated.
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