DNS problem

G

Goback

Verified User
Joined
May 15, 2011
Messages
22
Hi,
Edit: problem is solved , so main domain edited.
--
after a week the site dose not loaded yet!
i think this is DNS problem,but how can i resolve that?
 
Last edited:
Hello,

Make sure that bind/named is running on your server and ports TCP:53 UDP:53 are open for incoming and outgoing connections in your firewall.

Now I have this:


Code: 
> nslookup domain.com 95.215.ccc.ddd
DNS request timed out.
    timeout was 2 seconds.

Address:  95.215.ccc.ddd


DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
 
Last edited:
port 53 is open , BTW i used this commands to ensure about it:
Code: 
firewall-cmd --zone=dmz --add-port=53/tcp --permanent
firewall-cmd --zone=dmz --add-port=53/udp --permanent
named service is running and active,but it had some errors about resolving IP6 so i disabled IP6 in named.
 
By the way... you should not use the same ip for 2 DNS servers. This is part of the problem and the reason why IntoDNS is returning this:
ERROR: Looks like you have less than 2 nameservers. According to RFC2182 section 5 you must have at least 3 nameservers, and no more than 7. Having 2 nameservers is also ok by me.
Click to expand...
It's just asking for problems trying to use the same ip for 2 nameservers.
 
zEitEr said:
Please check this:

- Named is running, but it's not responding to requests
http://help.directadmin.com/item.php?id=387
Click to expand...

this is command
Code: 
netstat -lnp | grep named
and this is output:
Code: 
tcp        0      0 IP:53       0.0.0.0:*               LISTEN      1549/named
tcp        0      0 127.0.0.1:53            0.0.0.0:*               LISTEN      1549/named
udp        0      0 IP:53       0.0.0.0:*                           1549/named
udp        0      0 127.0.0.1:53            0.0.0.0:*                           1549/named
is it correct?
 
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i think this be important!
/etc/resolv.conf:
Code: 
# Generated by NetworkManager
search domain.com


# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com
 
Last edited:
I still think it's a firewall related issue. You should check your firewall once more or even disable it and check it.
 
zEitEr said:
I still think it's a firewall related issue. You should check your firewall once more or even disable it and check it.
Click to expand...

i stopped the firewall now,but the problem is exists yet.
i think i must install centos6 instead of centos7!
 
Do you have other firewalls? Does your hosting company block any ports? Do you see packets on TCP:53 UDP:53 with tcpdump?
 
zEitEr said:
Do you have other firewalls? Does your hosting company block any ports? Do you see packets on TCP:53 UDP:53 with tcpdump?
Click to expand...
with tcpdump i can not see any log about port 53! (>tcpdump)
but with scans that i did with nmap the port 53 both tcp and udp were open.
this problem is going to make me crazy:confused:
 
Then it might be your hosting company who is blocking the port. Did you check with them?
 
first a special thanks to zEitEr for following my problem.
yes i checked, there is no problem with them
i think something is wrong with centos network settings,where can i see a correct setting from this files(centos 7):
Code: 
/etc/sysconfig/network-scripts/ifcfg-INTERFACE
/etc/resolv.conf
and any other files related to DNS
another question is that what settings must be okayed after DA installing about DNS
 
problem solved,tnQ for helps : )
there was hosting company problem in blocking some DNS options.
 
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