Ensure that the client server list contains entries for the master server and any media servers that can be used during a backup or restore.

Examine the status or the progress log on the client for messages on why the restore failed. Also, check the All Log Entries report on the server.

Check ownership and permission on directories where files are restored.

Check ownership and permission on the Oracle instance that you restore.

Check the NetBackup dbclient and user_ops logs for additional failure information.

If restoring to an alternate client using RMAN, more information is available in the following technical article:

https://support.cohesity.com/s/article/article-100022605

Check that the Oracle user on the client can successfully communicate with the master server by using the bpclntcmd -pn command.

Check that the Oracle user on the client can see the backup images on the master by using the bplist command.

On UNIX and Linux hosts, check that the oracle user has sufficient permissions to read /etc/services, /etc/nsswitch.conf, and /usr/openv/netbackup/bp.conf.

Ensure that the Oracle database is linked correctly, according to the NetBackup for Oracle Administrator's Guide (for example, $ORACLE_HOME/lib/libobk.so).

More information is available in the following technical article:

https://support.cohesity.com/s/article/article-100021454

Correct the problems that you find and retry the restore.