Ubuntu 14.04 LTS Samba share authentication keeps failing

📖 ~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

Clients cannot access shares despite valid-looking credentials.

Environment & Reproduction

Appears after password changes, domain drift, or smb.conf edits.

Root Cause Analysis

Samba user database mismatch or share ACL denies effective access.

Quick Triage

Check testparm output and recent auth log failures.

Step-by-Step Diagnosis

Verify smbpasswd entries, unix users, and share-level permissions.

Solution – Primary Fix

Resync credentials, correct smb.conf parameters, and reload services.

Solution – Alternative Approaches

Use dedicated service account and simplified share ACL model.

Verification & Acceptance Criteria

Expected users authenticate and read/write per policy.

Rollback Plan

Restore prior smb.conf and user database backup.

Prevention & Hardening

Track config changes and validate with staged client tests.

Related Errors & Cross-Refs

NT_STATUS_LOGON_FAILURE and access denied messages.

Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.

View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Samba authentication and share permission documentation.