You can remove a host header and permanently delete it from
the database.
Open the Organization
Site Administrator Home
page.
In the IIS
Web Service area, click Manage
Host Headers.
On the Host Headers
page, select the Host Header to
be removed from the list.
Click the Remove
tab.
Click OK
to confirm. The host header is removed from the list.
Note:
If you delete a host header the site is not accessible.