dns: connection timed out vs Host not found

[Kevin Darcy]

Sergejs wrote:

> I have Linux box with Redhat Linux 7.2 and bind (ver. 9.2.1).
> /etc/named.conf has 3 zone files and forwarders.
> I have found a very interesting problem.
>
> I am trying to perform DNS lookup on  groups.google.com :
> host groups.google.com
> groups.google.com has address 216.239.51.119
> groups.google.com has address 216.239.35.119
>
> When the host is not accessible:
> host any.groups.com
> Host any.groups.com not found: 3(NXDOMAIN)
>
> But when I am trying to resolve  www.mobile-media.ch , host utility
> prints: no servers..
> host www.mobile-media.ch
> ;; connection timed out; no servers could be reached
>
> During resolving of  www.mobile-media.ch  host my dns-daemon doesn't
> respond and I cann't resolve other  normal  hosts.
>
> I can resolve any host exclude  www.mobile-media.ch . What does it
> mean? Why my named daemon doesn't respond during  www.mobile-media.ch
> resolving?

Neither of the delegated nameservers for the mobile-media.ch domain
(ns.hostcenter.com and ns2.hostcenter.com) are configured as
authoritative for the zone.

> PS. Host  www.hiugo.com  has a similar problem.

Queries to both of the delegated nameservers (layla.hiugo.com and
karin.hiugo.com) are timing out for me.


- Kevin