NetWorker: Authentication Fails After NRE Upgrade on Linux Server

• NetWorker Management Console (NMC) login fails with an error indicating that user credentials cannot be validated.
• NMC displays messages such as:

“An error occurred while validating user credentials. Verify that the Dell/EMC Authentication Service is running.”
“Failed connecting to [server] (0x80004005). Couldn't connect to server.”
“Please check the server or user credentials.”

• Execution of any authc_mgmt command fails with a connection error.
• The following error is returned when running authentication commands:

org.springframework.web.client.ResourceAccessException: 
I/O error on POST request for "https://<NetWorker_server>:9090/auth-server/api/v1/sec/authenticate":
Connection refused

• Only the nsrexecd and nsrlogd processes are running on the NetWorker server.

An incomplete postupgrade NRE configuration caused this issue. After the NRE upgrade, the required configuration scripts were not successfully applied, resulting in authentication services not being properly initialized. 

Once the NRE upgrade is complete, the required postupgrade configuration scripts must be ran to properly initialize the NetWorker authentication service.

1. Run the NRE configuration script:

/opt/nre/nreconfig.sh

2. Run the Authentication Service configuration script:

/opt/nsr/authc-server/scripts/authc_configure.sh

3. Start the NetWorker service. Verify that the NetWorker processes start successfully.

systemctl start networker 
systemctl status networker

4. Confirm that NMC login functions as expected.