Avamar: How to Resolve NDMP Authentication Errors for Primary Backup Jobs

Summary: NDMP backup/restore jobs fail with NDMP_NOT_AUTHORIZED_ERROR. Causes: ndmp‑user password mismatch between NAS filer and Avamar NDMP accelerator or NDMP service disabled on the NAS. Verify no active avtar jobs, check ndmp.cfg password, ping, and curl to NAS port 10000, run avndmp --browse, and ensure that avfirewall is not blocking traffic. ...

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Instructions

Resolving NDMP Authentication Errors

Prerequisites

  • SSH access to the NDMP accelerator using a user with administrative privileges
  • Root access on the accelerator
  • Knowledge of the NAS IP address and the NDMP client directory name

Procedure

  • Connect to the NDMP accelerator and become root.
  • Confirm that no Avamar backup jobs are running.
  • If the NDMP user password was changed on the NAS, update the accelerator configuration.
  • Verify the NDMP configuration file.
  • Test network connectivity to the NAS.
  • Confirm that the NDMP service port (10000) is reachable.
  • Run an NDMP browse command to validate authentication.
  • If the browse fails, check the Avamar firewall on the accelerator.
  • If authentication still fails, verify the NDMP user settings on the specific NAS platform.

Step‑by‑Step Details

1. SSH to the accelerator and become root.
$ ssh admin@[ACCELERATOR_HOST]
# su -
Password:
2. Verify that no Avtar jobs are active.
# ps -ef | grep avta[r] | wc -l

 

CAUTION: Running avsetupndmp terminates all Avtar processes. Obtain approval before stopping any active jobs.
3. Update the NDMP password (if changed on the NAS)
# avsetupndmp
4. View the NDMP configuration file.
# cd /usr/local/avamar/var/[NDMP_CLIENT_DIRECTORY]/
# cat ndmp.cfg
5. Verify network reachability to the NAS.
# ping [NAS_IP]
6. Verify that the NDMP port (10000) is reachable.
# curl -v [NAS_IP]:10000
7. Test NDMP authentication with a browse command
# avndmp --browse `cat ndmp.cfg`
8. Check and disable the Avamar firewall if it may be blocking traffic.
# rpm -qa --last | grep avfwb
# systemctl status avfirewall
# systemctl stop avfirewall
# systemctl status avfirewall
9. Verify NDMP user settings on the NAS.

Affected Products

Avamar Plug-in for NDMP
Article Properties
Article Number: 000189641
Article Type: How To
Last Modified: 11 May 2026
Version:  8
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