[NBServerMigrator] VMware Backups and Restores fails with status 6 and 2820 after migration

Problem

VMware Backups and Restores fail with status 6 and 2820 respectively after migration using NBServerMigrator.

Error Message

Backup :

Error bpbrm (pid=31990) from client <client>: ERR - Error opening the snapshot disks using given transport mode: san:hotadd:nbd:nbdssl Status 23
Critical bpbrm (pid=31990) from client <client>: FTL - cleanup() failed, status 6
Error bptm (pid=32005) media manager terminated by parent process
Critical bpbrm (pid=31990) unexpected termination of client <client>
Info bpbkar (pid=0) done. status: 6: the backup failed to back up the requested files
end writing; write time: 0:00:26
User backup failed (6)

Restore

Error bpbrm (pid=3371) from client <client>: ERR - Error opening the snapshot disks using given transport mode: san:hotadd:nbd:nbdssl Status 23
Error bptm (pid=3379) cannot write data to socket, Connection reset by peer
Error bpbrm (pid=3371) client restore EXIT STATUS 24: socket write failed
NetBackup VMware policy restore error (2820)

Cause

NA

Solution

Re-Add the credentials of the Virtual Machine Servers
a) Run the following on the Target Primary server:
 

To Display Virtual Machine Credentials:

UNIX: /usr/openv/volmgr/bin/tpconfig -dvirtualmachines
Windows: {install_path}\Volmgr\bin\tpconfig -dvirtualmachines

 

To Update Virtual Machine Credentials:

UNIX: /usr/openv/volmgr/bin/tpconfig -update -virtual_machine <virtual_machine_name> -vm_user_id <user ID> -vm_type <virtual_machine_type> -requiredport <IP port number> -password <password>
Windows: {install_path}\Volmgr\bin\tpconfig -update -virtual_machine <virtual_machine_name> -vm_user_id <user ID> -vm_type <virtual_machine_type> -requiredport <IP port number> -password <password>

For more information: https://www.veritas.com/support/en_US/article.100020483

b) This can also be done via WebUI or via Java Console:
Webui: Workloads | VMware | VMware servers | Manage Credentials
Java Console: Media and Device Management | Credentials | Virtual Machine Servers | double click on the Virtual Machine Server name.