🟡 Medium   ⏱ 5–30 min  Last verified: 30 May 2026
Affected versions: Windows Server 2022

📖 ~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

Backups fail with access denied or network path not found for remote target share.

Environment & Reproduction

Windows Server 2022 build 20348 using SMB backup target with stored credentials.

wbadmin get status
Test-Path \backup01wsb$
cmdkey /list

Root Cause Analysis

Expired credentials, SPN/Kerberos fallback issues, or stale SMB sessions block access.

Quick Triage

Validate SMB connectivity and authentication path.

Test-NetConnection backup01 -Port 445
Get-SmbConnection
klist

Step-by-Step Diagnosis

Check backup event log for exact target and auth failure code.

Get-WinEvent -LogName 'Microsoft-Windows-Backup' -MaxEvents 100
Get-WinEvent -LogName Security -MaxEvents 100 | Where-Object Id -in 4625,4776
Illustrative mockup for windows-server-2022 — terminal_or_powershell
Backup target connectivity and credential checks — Illustrative mockup — Progressive Robot

Solution — Primary Fix

Refresh target credentials and clear stale SMB sessions.

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net use * /delete /y
cmdkey /delete:backup01
cmdkey /add:backup01 /user:CONTOSOsvc_backup /pass:UseSecret
wbadmin start backup -backupTarget:\backup01wsb$ -include:C: -quiet
Illustrative mockup for windows-server-2022 — event_or_log_viewer
Backup target authentication errors — Illustrative mockup — Progressive Robot

Solution — Alternative Approaches

Use iSCSI or local disk target when SMB auth dependencies are unstable.

iscsicli ListTargets
wbadmin start backup -backupTarget:F: -include:C: -quiet

Verification & Acceptance Criteria

Backup completes and new version appears on target.

wbadmin get versions
Get-ChildItem \backup01wsb$

Rollback Plan

Revert to previous known-good target and schedule retry.

wbadmin start backup -backupTarget:\backup02wsb$ -include:C: -quiet

Prevention & Hardening

Rotate service credentials safely and test backup write access daily.

Test-Path \backup01wsb$
Get-ScheduledTask -TaskName '*Backup*' | Select TaskName,State

Related to SMB signing policy mismatches and clock skew causing Kerberos failure.

Related tutorial: View the step-by-step tutorial for Windows Server 2022.

View all Windows Server 2022 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Microsoft Learn backup target best practices and SMB authentication troubleshooting.

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