Is this an attack? I get a lot of :

view external: query (cache) denied in the /var/log/messages

3 Answers 3


No that's no hack ;) Obviously Your DNS server isn't set up well. Try adding nameserver to DNS server's /etc/resolv.conf and add your subnet ( to /etc/bind/named.conf

acl internals {;; };

  • Can you explain why nameserver should fix it? And what will be the results in case of a web hosting server?
    – 16851556
    Dec 29, 2017 at 9:05

It is probably not an attack. The only one thing that I'd suggest to better bind9 configuration is to set up logging so that such kind of security lines are written in their own file. For example, in the "logging" stanza:

channel security_log { 
            file "/var/log/named-denied.log" versions 3;
            print-time yes;
            print-severity yes;
            print-category yes;
            severity info;


category security { security_log; };

If bind is configured well, that file will be filled with queries that shouldn't have been directed to your server in the first place. It is possible to extract recurring patterns, for example expired delegations --even after several years.


It's not a hack however you need to set up your server's DNS better. If you use cpanel for your control panel WHM should automatically pick up the information. If not you can fix it later on when you set up your name servers, set an ip to them, etc.

  • Please try to write understandable English.
    – vonbrand
    Mar 10, 2013 at 2:58

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