CentOS Stream 9 – Common Problem 078 – Diagnosis and Fix

📖 ~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

NetworkManager dispatcher scripts not executing on CentOS Stream 9 disrupts services and slows incident response until the root cause is resolved.

Environment & Reproduction

Custom dispatcher scripts in /etc/NetworkManager/dispatcher.d are silently skipped.

ls -l /etc/NetworkManager/dispatcher.d
systemctl status NetworkManager-dispatcher

Root Cause Analysis

Misalignment between network configuration and CentOS Stream 9 defaults causes the failure path described above.

Quick Triage

Confirm package state, service status, and recent changes before deeper diagnostics.

systemctl status
rpm -qa | grep -i 
journalctl -p err -b --no-pager | tail -100

Step-by-Step Diagnosis

Capture detailed logs, configuration deltas, and runtime state to isolate the failing component.

journalctl -u NetworkManager-dispatcher -n 100
ls -lZ /etc/NetworkManager/dispatcher.d

Solution – Primary Fix

Apply the targeted configuration change and restart the relevant services to restore expected behavior.

sudo chmod 755 /etc/NetworkManager/dispatcher.d/*.sh
sudo chown root:root /etc/NetworkManager/dispatcher.d/*
sudo restorecon -Rv /etc/NetworkManager

Solution – Alternative Approaches

Convert legacy scripts into systemd path units triggered by nm-online.

Verification & Acceptance Criteria

Validate the fix with deterministic checks and ensure no regressions in dependent services.

nmcli con up 
journalctl -u NetworkManager-dispatcher -f

Rollback Plan

Revert configuration and restart services to return to the previous known-good state.

rm /etc/NetworkManager/dispatcher.d/
systemctl restart NetworkManager

Prevention & Hardening

Lint dispatcher scripts in CI and validate SELinux labels.

Related Errors & Cross-Refs

Related: dispatcher scripts, SELinux contexts; see also adjacent topics in the CentOS Stream 9 common problems series.

Related tutorial: View the step-by-step tutorial for centos-stream-9.

View all centos-stream-9 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

CentOS Stream documentation, Red Hat upstream guides, and CentOS Stream 9 release notes covering this subsystem.