no servers could be reached

tigretigre at gmail.com tigretigre at gmail.com
Mon Oct 27 15:01:01 UTC 2008


On Oct 19, 1:52 am, i... at mtdatasure.com wrote:
> I have  bind 9.3.4 install and running on RH5.  I am not able to query it successfully.  Here are the trouble shooting techniques I have used thus far:  All of them work when run from the command line of the DNS server its self.  The trouble starts when trying to query this DNS server from another machine.  So again, locally, DNS queries are working.
>
> Explicitly using TCP, a query is successful
> dig @xx.xx.xx.xxx yahoo.com. soa +vc
>
> When using UDP (as I assume the following command does) no luck.  The following is printed.
> dig @xx.xx.xx.xxx yahoo.com.
>
> ; <<>> DiG 9.2.4 <<>> @xx.xx.xx.xxx yahoo.com.
> ; (1 server found)
> ;; global options:  printcmd
> ;; connection timed out; no servers could be reached

What finally worked for me was turning of my _local_ iptables and
realizing I was blocking UDP connections coming back to me from the
DNS server.  A quick edit to my local iptables restored everything to
perfect worknig order with or without TCP.

-Titi



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