🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026

📖 ~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

Users are prompted for passwords despite valid keys, impacting automation and incident response access.

Environment & Reproduction

After user home migration, hardening changes, SELinux relabel gaps, or copied keys with wrong ownership.

Root Cause Analysis

Incorrect file modes, disabled `PubkeyAuthentication`, bad `AuthorizedKeysFile`, or SELinux context mismatch.

Quick Triage

Verify `systemctl status sshd`, inspect `/etc/ssh/sshd_config`, and test with `ssh -vvv user@host`.

Step-by-Step Diagnosis

Use `journalctl -u sshd –since -30m`, `ls -laZ ~/.ssh`, and `sshd -T | grep -Ei ‘pubkey|authorizedkeysfile’`.

Illustrative mockup for rhel-8 — rhel8-sshd-config-check.webp
sshd configuration and key authentication settings reviewed — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Logs confirm accepted public key and session opens without password fallback prompts.

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Illustrative mockup for rhel-8 — rhel8-ssh-permissions-fix.webp
Correcting .ssh permissions and SELinux context for successful login — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Set secure modes, fix ownership, restore contexts using `restorecon -RF ~/.ssh`, and reload sshd.

Verification & Acceptance Criteria

Test fresh login from trusted client and confirm logs contain `Accepted publickey` entries.

Rollback Plan

Keep active root console/session before sshd changes so prior config can be restored safely if needed.

Prevention & Hardening

Use centralized key management, disable password auth where possible, and monitor failed key attempts.

`chmod 700 ~/.ssh && chmod 600 ~/.ssh/authorized_keys && restorecon -RF ~/.ssh && systemctl reload sshd`

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 OpenSSH hardening guidance, `man sshd_config`, and Red Hat access troubleshooting KBs.

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