Skip to main content

NinjaOne Backup — Error Code Master Reference

Audience: T1 / T2 Use when: A backup fails with a numeric error code and you need to identify what it means and where to go next.

General Errors (File/Folder and Image Backup)

Code Name Cause Summary Detailed Page
5 EFS Access Denied File is encrypted with Windows EFS — Lockhart can't read it Error 5
13 Access Denied NTFS permissions block SYSTEM account from reading a path Error 13
20 File Deleted from Backup Path A specifically configured backup path no longer exists Error 20
59 IO Error / SSL Certificate Outdated root certificates prevent secure connection Backup Alert Response (page 2008)
121 Semaphore Timeout Windows OS timeout waiting for disk or NAS response Error 121
131 Connection Lost Network dropped mid-backup during cloud upload Error 131
150 Backup Database Error Internal Lockhart database corruption — NinjaOne support required Error 150

VSS Errors (Image Backup)

Code Name Cause Summary Detailed Page
132 VSS Snapshot Failed VSS writer in failed state; AV interference; disk space Error 132
307 Low Disk Space — VSS Risk Source volume <20% free; VSS needs scratch space Error 307
309 Disk Access Non-Retryable NTDS or other VSS writer hard-failed (common on DCs) Backup Alert Response (page 2008)
327 VSS Writer Error Specific writer failure during image backup Error 327

Storage & NAS Errors

Code Name Cause Summary Detailed Page
303 NAS Path Not Configured No local storage location set up in NinjaOne org Error 303
305 Unable to Access Local Storage SYSTEM account can't reach NAS — permissions or path wrong Error 305
306 Snapshot Deleted While Uploading VSS snapshot was pruned before upload completed Error 306
308 Unable to Determine Free Space WMI can't query disk space — WMI corruption Error 308
310 Unable to Backup Volume Volume-level failure — disk health or partition issue Error 310
311 Integrity Check — Too Many Errors Repository has excessive inconsistent files Error 311
312 Repository Root Folder Missing backups/ninjaone folder was deleted from NAS Error 312
313 File Not Found (Integrity) File referenced in backup index no longer exists Error 313/314
314 Inconsistent File (Integrity) File content doesn't match index during integrity check Error 313/314
319 NAS Timed Out NAS unresponsive mid-job — HDD sleep, overload, or failing drive Backup Alert Response (page 2008)
342 NAS Write Error NAS rejected the write — permissions, full share, hardware Error 342
344 NAS Storage Low (Warning) Backup destination running low — heads-up, not yet critical Error 344
345 NAS Storage Critically Low Critical threshold reached — backups will fail Backup Alert Response (page 2008)

NAS Authentication Errors

Code Name Cause Summary Detailed Page
315 NAS Authentication Failed dtcbackup credentials rejected by NAS Backup Alert Response (page 2008)
316 No Host Found for NAS NAS hostname doesn't resolve — DNS or NAS offline Error 316
317 Unable to Request Credentials Lockhart can't reach NinjaOne cloud to fetch NAS credentials Backup Alert Response (page 2008)
318 Network Storage Not Defined No NAS storage location configured at org/location/device level Error 318

Cloud & Connectivity Errors

Code Name Cause Summary Detailed Page
360 Cloud Communication Error AWS cloud unreachable — firewall, DNS, or platform outage Backup Alert Response (page 2008)
10053 Connection Aborted by Host Host machine's software terminated the TCP connection Error 10053/10054
10054 Connection Reset by Host Remote host forcibly closed the TCP connection Error 10053/10054

Quick Triage Decision Tree

Backup failed with error code →
│
├─ 5, 13, 20 → File/permission issue → Chapter 7
├─ 59 → SSL/certificate issue → page 2008
├─ 121 → Semaphore timeout → disk or NAS sleep → Chapter 4
├─ 131, 10053, 10054 → Network drop → Chapter 6
├─ 132, 307, 309, 327 → VSS issue → Chapter 4
├─ 150 → Database corruption → escalate to NinjaOne Support
├─ 303, 305, 310, 311, 312, 313, 314, 342, 344, 345 → Storage issue → Chapter 5
├─ 315, 316, 317, 318 → NAS auth/config → Chapter 8
├─ 306, 308 → VSS/disk space boundary → Chapter 4 or 5
└─ 360 → Cloud comm failure → Chapter 6
Back to top