When viewing the Enterprise Overview page in RA/NFA the "Top Hosts View" may not show host names.
However when looking at Conversation Summary or Host Summary interface or custom reports the host names are shown. Also the Administration->Addresses page shows host names for these hosts.
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This occurs when RA/NFA has more than one domain in the reporter.domains table.
To verify, login to the reporter database on the RA/NFA console server and query the domains table to see if there is more than just the default domain here.
mysql -P3308 reporter select * from domains;
If there are more than one, you can delete these from the NPC/CAPC server and perform a full resync of the RA/NFA data source.
In NPC the domains are located under "Admin->Groups->All Groups->System-Groups->All Domains".
You can delete the non default domains if not needed from here then do a full resync of the RA/NFA data source.
In CAPC you can simply go to "Admin->Domains" to find and delete the domains.
Once the domains have been deleted, and the RA/NFA data sources has gone through a Full Resync from NPC/CAPC, go back to the Enterprise Overview page, and hosts with host names should now be displayed under the "Top Hosts" view.