RHEL 8 – NFS Mount Access Denied by firewalld and SELinux Policy

📖 ~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

NFS shares fail to mount, disrupting application startup and file-dependent workloads.

Environment & Reproduction

Occurs after host hardening where firewalld services or SELinux booleans were not adjusted.

Root Cause Analysis

Required NFS-related ports/services or SELinux permissions are blocked under enforcing mode.

Quick Triage

Check mount errors, firewalld zone rules, SELinux mode, and recent journalctl kernel messages.

Step-by-Step Diagnosis

Validate rpcbind and nfs-server service state plus export policy and AVC events.

Solution – Primary Fix

Enable required firewalld NFS services, set correct SELinux booleans, and restart NFS services.

Solution – Alternative Approaches

Restrict access with source-based zones and export options for least-privilege network exposure.

Verification & Acceptance Criteria

Mount succeeds consistently and read/write behavior matches export policy expectations.

Rollback Plan

Revert firewall and SELinux changes if they conflict with approved security posture.

Prevention & Hardening

Document NFS port and boolean requirements and validate after each baseline update.

Related Errors & Cross-Refs

mount.nfs access denied by server, RPC timeout, AVC denied name_connect for nfsd.

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

RHEL 8 NFS server/client, firewalld service objects, and SELinux boolean references.