Commands and operations fail after NetBackup NBServerMigrator migration

Problem

After performing migration using NBServerMigrator, a few commands and operations fail.

Error Message

After successfully doing web login using the bpnbat command, the nbcertcmd command fails with:
A web login is required. Run the 'bpnbat -login -loginType WEB|WEBUI|APIKEY' command to login.
EXIT STATUS 5930: The request could not be authorized.

Communication issues between the media and the target primary server. Image verification failing with error:
Critical bpdm (pid=205112) sts_open_server failed: error 2060405 Wrong MSDP multi-domain configuration is detected. This NBU domain should use a different MSDP user to access the MSDP storage server. See NetBackup Deduplication Guide for details.

Restore operation fails on target primary, right after migration with error:
policy restore error  (2800)

Cause

N/A.

Solution

1. Stop NetBackup services on the target primary server and then on the Media server:

1.1. Windows:
<install_path>\veritas\netbackup\bin\admincmd\bpdown -f -v

1.2. Linux:
/usr/openv/netbackup/bin/goodies/netbackup stop

2. Start NetBackup services on the target primary server and then on the Media server.

2.1. Windows:
<install_path>\veritas\netbackup\bin\admincmd\bpup -f -v

2.2. Linux:
/usr/openv/netbackup/bin/goodies/netbackup start

Note: It can sometimes take a few minutes after the restart of NetBackup services for commands/operations to be successful. Please wait for a few minutes and retry the command or operation if unsuccessful after the services restart.