host unreachable DNS errors in log messages or logwatch
Posted by HostsVault | Posted in How-To's | Posted on 16-04-2009-05-2008
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We faced this kind of errors on one of our servers while reviewing our logs
client 1.2.3.4 view external: error sending response: host unreachable: 7 Time(s)
client 5.6.7.8 view external: error sending response: host unreachable: 12 Time(s)
After thoroughly investigating this it turned out to be faulty firewall rules
So folks edit your APF or CSF or even iptables rules and allow outgoing packets to port 53 (both Udp and TCP) and such errors shouldn’t reoccur .
Try it and tell me how it goes ;)
