NetWorker: AIX Client backups fails with "not properly configured" message

The AIX Client NSRLA Certificate shows a blank name or a Unicode Character "▒" (U+2592) for the hostname in /nsr/res/nsrladb.

The backup session log shows:

DD/MM/YY HH:MM:SS lgto_parms failed: Client ' ' is not properly configured on the NetWorker Server
175297:save: Unable to set up the direct save with server '###.###.###': Client ' ' is not properly configured on the NetWorker Server
175024:save: Cannot open a save session with NetWorker server '###.###.###': Client ' ' is not properly configured on the NetWorker Server

The AIX client /etc/hosts file record is missing the local details or an invisible Unicode Character "▒" added. The affected AIX client uses the /etc/hosts when creating the NSRLADB database certificate and the entry is causing the problem.

Example blank entry in the NSRLADB database:

my-aixp8-1:/ # nsradmin -d /nsr/res/nsrladb
NetWorker administration program.
Use the "help" command for help, "visual" for full-screen mode.
nsradmin> p nsrla
                        type: NSRLA;
               administrator: root, "user=root,host=";

Example Unicode character in the NSRLADB database:

my-aixp8-1:/ # nsradmin -d /nsr/res/nsrladb
NetWorker administration program.
Use the "help" command for help, "visual" for full-screen mode.
nsradmin> p nsrla
                        type: NSRLA;
               administrator: root, "user=root,host=▒";

Include the AIX client hostname and IP in the local /etc/hosts file to populate the local NSRLADB database.

1. Open an SSH session to the AIX client.
2. Make a copy of the existing hosts file: cp /etc/hosts /etc/hosts_orig
3. Stop the NetWorker services: nsr_shutdown
4. Rename the existing NetWorker res directory: mv /nsr/res /nsr/res_old
5. Start the NetWorker services: /etc/rs.nsr
6. Validate the hostname in the online NSRLADB database: nsradmin -p nsrexec 
7. Validate the hostname in the offline NSRLADB database: nsradmin -d /nsr/res/nsrladb
8. Clear the NSR Peer information about NetWorker Server: NetWorker: Fixing inconsistent NSR peer information
9. Run a backup of the affected AIX client.

If the folders /nsr/res, or /nsr/res/nsrladb cannot be renamed, perform the following:

1. Fix the name in the nsrladb as text file to call it nsrladb_manually_fixed.
2. Use the nsradmin "-i" option to input and merge the nsrladb:

# nsradmin -d /nsr/res/nsrladb -i /tmp/nsrladb_manually_fixed

3. Stop NetWorker services: nsr_shutdown
4. Start NetWorker services: /etc/rs.nsr