NetWorker: FS backup failure with an error save: Unable to set up the direct save with server

FS backup to Data Domain is failing.

Upon checking the action logs, found the below error: -

175297: save: Unable to set up the direct save with server 'xxxx': yyyy:E:\: Unable to perform backup for save-set ID '1234' with DIRECT_ACCESS=Yes, check device and pool configuration to enable Client direct.

No Connection between Client to Data Domain.

Host file/DNS entries are either missing or incorrectly configured.

Port connectivity failures detected between:

• Client and Data Domain (DD)
• Affected ports: 111, 2049, 2051, 2052

To resolve the connectivity issue between the Client and Data Domain, follow the steps below:

Update Host Resolution: 

• Ensure that the /etc/hosts file or Domain Name System (DNS) entries on the Client and Data Domain are correctly configured.
• Both systems must resolve each other’s hostnames accurately.
• NetWorker: Name Resolution Troubleshooting Best Practices

Verify Network Connectivity:

• Engage your Network Team to ensure that the following ports are open and accessible in both directions:
  111
  2049
  2051
  2052

Once the connectivity issues have been resolved, run the backup for the client to verify that the backup completes successfully without errors.

Ports and name resolution can be verified on NetWorker systems using the nsrports command:
nsrports -t HOSTNAME -p PORT

Ensure that the host file or DNS entries are correctly configured on both the NetWorker Server and the Data Domain.

Verify that the following ports are open and accessible between the NetWorker (or Backup) Server and the Data Domain, in both directions:
111,2049,2051,2052.