Ever wonder how a Data Protector client identifies its Cell Manager? With Unix-based clients, the name of the Cell Manager is stored in a flat file named "cell_server".
# cat /etc/opt/omni/client/cell_server neelix.hp.local
Windows clients employ a registry key to store the same value. You'll find the string CellServer in HKLM\SOFTWARE\Hewlett-Packard\Openview\OmniBackII\
Be aware that Data Protector treats a host's short name as being unique from its long name or fully-qualified domain name (FQDN). Thus, it would regard "neelix" and "neelix.hp.local" as two entirely separate entities. Always ensure that you have consistent name resolution across all Data Protector clients, the Cell Manager, and any local PCs where you may be running the Data Protector Manager (GUI). This goes for forward as well as reverse lookups.