Be sure that this hosts file is not in use. A hosts file is not in use when:
There are no references to it in the Ping exclusion ranges, templates and/or hosts files section of the general settings page.
There are no references to it in the Ping inclusion ranges, templates, and/or hosts files section of every existing discovery task.
Only delete hosts files if you no longer need them or if you are creating a new hosts file.
To delete a hosts file:
Select OptionsDiscovery and select the Hosts Files tab.
Select hosts files to delete and click [Delete]. A confirmation box appears.
Click [OK] to delete the hosts files, or click [Cancel] to cancel the delete process.