NetWorker: NMC login fails "Unexpected Error Occurred. Check the logs"

Summary: NetWorker Management Console (NMC) login fails: "Unexpected Error Occurred. Check the logs."

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Symptoms

NetWorker Management Console (NMC) login fails with the following error:  "Unexpected Error Occurred. Check the logs"

Cause

NetWorker NMC GST (nmcdb) internal corruption.

Resolution

Option One:

Use the mminfo command to check for backups of the nmcdb_stage directory:

mminfo -avot -q name="\path\to\your\nmcdb_stage\pgdata"

Example:

PS C:\Users\Administrator.NETWORKER> mminfo -avot -q name="C:\Program Files\EMC NetWorker\Management\nmcdb_stage\pgdata"
 volume        type   client           date     time         size ssid      fl   lvl name
...
win_srvr02.networker.lan.dddefault.001 Data Domain win-srvr02.networker.lan 4/26/2026 2:01:33 PM 52 MB 3320730367 cb full C:\Program Files\EMC NetWorker\Management\nmcdb_stage\pgdata
win_srvr02.networker.lan.dddefault.001 Data Domain win-srvr02.networker.lan 4/27/2026 2:01:37 PM 52 MB 3220153475 cb full C:\Program Files\EMC NetWorker\Management\nmcdb_stage\pgdata

Recover the nmcdb using the recoverpsm command: NetWorker - How to Recover the NetWorker Management Console database

Option Two:

Re-create the nmcdb. Using a new nmcdb requires reconfiguring any "NMC Roles" previously defined for local or external (AD/LDAP) accounts. Any NetWorker user accounts or external authorities previously configured are retained in the NetWorker AUTHC server. Using a fresh nmcdb resets NMC "Reports" data.

Windows Servers:

On Windows servers, the nmcdb is initialized during installation. NetWorker must be uninstalled and reinstalled with a fresh NMC install path.

  1. Stop any NetWorker backups (if running).
NOTE: If the NMC server is installed on a different host than the NetWorker server, you do not need to stop backups.
  1. Stop NetWorker services: net stop nsrexecd /y
  2. Uninstall NetWorker NMC. This can be done one of two ways.
    1. Uninstall the complete NetWorker package from Windows "Programs and Features." This does not delete any NetWorker database or configuration files.
    2. Uninstall NMC using Windows wmic and sc command to only uninstall NMC package: NetWorker: How to Uninstall NMC without Installing Entire NetWorker Package (Windows)
  2. Rename the NMC installation folder; Default path C:\Program Files\EMC NetWorker\Management.
  3. Install the NetWorker NMC package again, this creates a new NMC installation folder and nmcdb. 

Linux Servers:

  1. Stop NMC services: systemctl stop gst
  2. Rename the nmcdb directory: mv /nsr/nmc/nmcdb /nsr/nmc/nmcdb_$(date -I)
  3. Rerun the NMC configuration script: /opt/lgtonmc/bin/nmc_config
  4. Start NMC services: systemctl start gst

Affected Products

NetWorker, NetWorker Series

Products

NetWorker Family, NetWorker Management Console
Article Properties
Article Number: 000213225
Article Type: Solution
Last Modified: 17 May 2026
Version:  5
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