docs. update blacklist chapter (#516)

NethServer/dev#6212
NethServer · Jul 2, 2020 · 140cea4 · 140cea4
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diff --git a/administrator-manual/en/blacklist.rst b/administrator-manual/en/blacklist.rst
@@ -31,6 +31,8 @@ A popular free IP blacklist is `Firehol <https://github.com/firehol/blocklist-ip
 
 An example of DNS blacklist is available at `dns-community-blacklist <https://github.com/NethServer/dns-community-blacklist>`_.
 
+.. warning:: If :ref:`proxy-section` is enabled, in any mode, :guilabel:`DNS blacklist` will not work for proxied hosts.
+
 Whitelist
 ---------