📖 ~1 min read
Table of contents
Symptom & Impact
Server boots without network connectivity, breaking service startup dependencies and remote access.
Environment & Reproduction
Reboot RHEL 8 host and verify active connections with nmcli con show –active.
Root Cause Analysis
Connection profile has autoconnect disabled, wrong interface binding, or invalid route settings.
Quick Triage
Run systemctl status NetworkManager and review journalctl -u NetworkManager -b for profile errors.
Step-by-Step Diagnosis
Inspect profile with nmcli con show and confirm DEVICE, autoconnect, and method details.
Solution – Primary Fix
Set nmcli con mod connection.autoconnect yes, correct interface mapping, then nmcli con up.
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Solution – Alternative Approaches
Recreate corrupted profile using nmcli con add with explicit IPv4 and DNS parameters.
Verification & Acceptance Criteria
Connection auto-starts after reboot, routing is correct, and dependent services start normally.
Rollback Plan
Restore previous profile files from /etc/NetworkManager/system-connections and restart NetworkManager.
Prevention & Hardening
Track profile changes in configuration management and test reboot behavior during maintenance windows.
Related Errors & Cross-Refs
Can overlap with firewalld zone issues, DHCP lease failures, and DNS resolver misconfiguration.
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
See RHEL 8 networking documentation and nmcli man pages for persistent network profile administration.
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