Netbackup Database Extension SQL GUI

Hi,

I've a failover cluster composed by two node, and on each phisycal server there is a sql instance.

Server A > Instance1
ServerB > Instance2

If i open the Netbackup SQL gui on server A there is this situation:
Instance1 > i see databases and on right pane i see db "unavailable"

Instance2 > it's ok, i see db.

If i open the Netbackup SQL gui on server B there is this situation:
Instance1 > it's ok
Instance2 > it's ok

On Set SQL server connection properties, at Host menu, when i click on "Browser for more host" where it search for host?

Please someone may help on this?

Thanks and Regards