RHEL 7 – SELinux AVC Denial Prevents Daemon from Binding Port

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Service starts but cannot accept traffic because SELinux denies required bind action.

Environment & Reproduction

Typical when custom applications use non-default ports in enforcing mode.

Root Cause Analysis

SELinux port type does not allow this domain to bind the configured service port.

Quick Triage

Run getenforce, check ausearch AVC records, and inspect journalctl for denial events.

Step-by-Step Diagnosis

Map denied domain and target port using semanage port -l and policy context review.

Solution – Primary Fix

Add correct SELinux port label with semanage and restart the impacted service.

Solution – Alternative Approaches

Generate a minimal local policy module only if labeling cannot resolve the denial.

Verification & Acceptance Criteria

No fresh AVC denials appear and clients connect successfully on the target port.

Rollback Plan

Remove custom policy or mapping if new SELinux changes broaden access unexpectedly.

Prevention & Hardening

Keep SELinux enforcing, document semanage changes, and review with security teams.

Related Errors & Cross-Refs

SELinux is preventing, denied name_bind, service active but unreachable.

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

RHEL 7 SELinux troubleshooting and policy management documentation.