Hi Eduardo,
On Mon, Sep 17, 2012 at 10:34:19AM +0100, Eduardo Duarte wrote:
  [...]
 interfaces {
   ipv4 { address 127.0.0.1@53; }
   ipv4 { address 193.137.197.25@53; }
 [...]
 2012-09-17T10:25:40.230967+01:00 Binding to interface 127.0.0.1 port 53.
 2012-09-17T10:25:40.231283+01:00 Binding to interface 193.137.197.25
 [...]
 [root@ns-test06 ~]# dig @127.0.0.1 zonetest-06.dns.pt
 ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.1 <<>> @127.0.0.1
 zonetest-06.dns.pt
 ; (1 server found)
 ;; global options: +cmd
 ;; connection timed out; no servers could be reached
 *********************************
 Can anyone help me with this problem? 
Check your iptables ruleset and output of lsof -i4.
This should show you something like:
unbound   1419 unbound    3u  IPv4  10782      0t0  UDP localhost:domain
unbound   1419 unbound    4u  IPv4  10783      0t0  TCP localhost:domain (LISTEN)
(Example with unbound).
Cheers
~ollie
--
Oliver PETER       oliver(a)opdns.de       0x456D688F