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For the DNS agent to work correctly, set up the primary and the stealth masters to accept and correctly process updates. You can test this via the nsupdate command that ships with the operating system—refer to the nsupdate manpage for usage. By default both SuSE and Red Hat install with SELinux enabled and configured to disallow the DNS server process named, to modify the on-file DNS database—the zone files. You must set up SELinux on the DNS server systems to allow the named process to update. Refer to the operating system documentation for more information.