NetWorker: Unable to access NWUI | Page can't be found

When trying to access, NWUI is getting below error.

Below are the log messages from nwui.raw.

127107 1694068051 1 5 0 822093632 1614 0 *****.backup.cba nwuictld NSR notice 16 Startup complete 0
127105 1695827017 2 5 0 822093632 1614 0 *****.backup.cba nwuictld NSR warning 62 Stop command for daemon %s failed, sending TERM signal instead 1 20 44 /nsr/nwui/monitoring/app/bin/nwui_monitoring
0 1695827017 1 5 0 660702976 1614 0 *****.backup.cba nwuictld NSR notice 6 %s: %s 2 0 15 nwui_monitoring 0 44 ERROR:Unable to get nwui install directory.
0 1695827017 1 5 0 660702976 1614 0 *****.backup.cba nwuictld NSR notice 6 %s: %s 2 0 6 nwuidb 0 38 Stopping NWUI Database (Postgres DB):
0 1695827017 1 5 0 660702976 1614 0 *****.backup.cba nwuictld NSR notice 6 %s: %s 2 0 6 nwuidb 0 35 ERROR: Postgres DB is not running!
127109 1695827020 1 5 0 822093632 1614 0 *****.backup.cba nwuictld NSR notice 17 Shutdown complete 0

Possible Reasons:

NWUI services might not be up.
NWUI database (Postgres DB) might not be running.

Run the below commands to check if NWUI services are running or not.

On Linux:
ps -ef | grep nwui

On Windows:
tasklist | findstr nwui

On Linux:

Must run nwui_configure.sh (script) from /opt/nwui/scripts
If the issue still persists, reinstall NWUI and run nwui_configure.sh (script)

Reinstallation of NWUI:

Uninstalled:

[root@***** linux_x86_64]# rpm -evh lgtonwuiserv-19.8.0.4-1.x86_64
Preparing...                          ################################# [100%]
NOTE: NetWorker Web UI Server is uninstalled successfully.
Cleaning up / removing...
  1:lgtonwuiserv-19.8.0.4-1          ################################# [100%]

Installed:

[root@***** linux_x86_64]# rpm -ivh lgtonwuiserv-19.8.0.4-1.x86_64.rpm
warning: lgtonwuiserv-19.8.0.4-1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ff48d101: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
  1:lgtonwuiserv-19.8.0.4-1          ################################# [100%]

Run nwui_configure.sh (script):

[root@***** linux_x86_64]# /opt/nwui/scripts/nwui_configure.sh
Specify the directory where the Java Standard Edition Runtime Environment (JRE) software is installed [/usr/java/latest]:
Specify the host name of the NetWorker Authentication Service host [*****]:
Specify the host name of the NetWorker Server to be Managed by NWUI [*****]:
Specify the AUTHC port for Networker Server which is managed by NWUI [9090]:
The NetWorker Web UI Server requires a keystore file to configure encryption and to provide SSL support.
EMC recommends that you specify a password that has a minimum of nine characters,
with at least one upper case letter, one lower case letter, one number and one special character.
Do you want to use the existing keystore /nsr/nwui/monitoring/app/conf/nwui.keystore [y]?
Specify password for the existing keystore:ERROR: Keystore password cannot be empty
Specify password for the existing keystore:ERROR: Keystore password cannot be empty
Specify password for the existing keystore:ERROR: Keystore password cannot be empty
Specify password for the existing keystore:
The install will use the existing certificate "emcnwuimonitoring" for nwui services.
A database already exists in /nsr/nwui/monitoring/nwuidb, do you want to retain this database [y]?
The installation completed successfully

On Windows:

Re-install NWUI

To uninstall NWUI:
Control Panel - Select NetWorker - change - clear NWUI - change.

To install NWUI:
Control Panel - Select NetWorker - change - check NWUI - change.