NetworkManager Connection Missing After Reboot

📖 ~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

Interface is down after reboot even though it worked before shutdown.

Environment & Reproduction

Connection profile was deleted, renamed, or has autoconnect disabled.

Root Cause Analysis

Run systemctl status NetworkManager and confirm it is active and enabled.

Quick Triage

Use nmcli connection show to verify expected profile names and UUIDs.

Step-by-Step Diagnosis

Set nmcli connection modify connection.autoconnect yes for persistent startup.

Solution – Primary Fix

Run nmcli connection up and validate route and DNS assignment.

Solution – Alternative Approaches

Confirm profile interface-name matches actual NIC naming on the host.

Verification & Acceptance Criteria

Run journalctl -b -u NetworkManager for profile load and activation failures.

Rollback Plan

Ensure interface is bound to correct zone for required traffic.

Prevention & Hardening

Servers become unreachable after restart, causing service outage windows.

Related Errors & Cross-Refs

Keep out-of-band console access available for network misconfiguration events.

Related tutorial: View the step-by-step tutorial for rhel-9.

View all rhel-9 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Manage nmcli profile definitions through infrastructure-as-code for consistency.