Server Lost Ability To Resolve Names

May 20, 2009

my server seems to have lost its ability to do name lookups:


[root@cp ~]# wget =>`ossec-hids-2.0.tar.gz'
Resolving failed: Temporary failure in name resolution.

it hangs on the "Resolving bit for a long time.

my resolv.conf file is as follows:



which are the 2 nameservers of my datacenter.

I tried doing a /scripts/upcp --force and I get this:


[root@cp ~]# /scripts/upcp --force
Updating /scripts...
Sync Source:

and it just hangs there

the sites I am hosting use PHP script that make a lot of outbound web connections so this is crippling my server

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PHP Bug- PHP Can't Resolve Domains, Server Can

Jul 23, 2007

My VPS was a clean build 2 weeks ago and so far i have installed cpanel and configured everything and added accounts. I began that one of my scripts that uses gethostbyaddr($ip) was failing to resolve any of the ip's it received. I made another PHP file to test this, with this code:

PHP Code:

 <?phpecho file_get_contents[url];?>

Resulting in:

Warning: file_get_contents() [function.file-get-contents]: php_network_getaddresses: getaddrinfo failed: Name or service not known

The thing is, the VPS is resolving domains just fine

I can ping, send emails, even dig:

[root@server etc]# dig

; <<>> DiG 9.2.4 <<>>
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34548
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 4

; IN A

;; ANSWER SECTION: 300 IN A 300 IN A 300 IN A

;; AUTHORITY SECTION: 343652 IN NS 343652 IN NS 343652 IN NS 343652 IN NS

;; ADDITIONAL SECTION: 343143 IN A 343143 IN A 343143 IN A 343143 IN A

;; Query time: 62 msec
;; WHEN: Tue Jul 24 04:49:35 2007
;; MSG SIZE rcvd: 212

I have no clue what's up, and i think there must be a guru here that has an idea of what is going on?

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My Server Can't Resolve Hosts

Aug 19, 2007

i use centos based server. yesterday everything was OK. but now, when i connect via SSH, my server can't resolve hosts. wget, ping, or curl don't work. also i use VNC to remote desktop. when try to open a page via firefox, it says server not found.

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DNS :: The Hostname ( Resolves To . It Should Resolve To

Jun 24, 2008

5 hours back I got fails of services mails and then I restart VPS but after few minuts services status up but sites not working.

I contact with support and they told me "Service Named is down on your server".

Any how they update Cpanel, during updation I got email that with subject


[ipcheck] Problems with dns setup on

The hostname ( resolves to . It should resolve to

Support added entries for me, but sites still not up. They again updating CPANEL. Seems they unable to solve problem.

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Sep 22, 2007

I have 10 dedicated Ip addresses and recently spotted in my stats for one of my sites, that some odd domain names were mirroring my site. On checking they were using my IP address and displaying my website.

I have no idea how they could have done this.

I changed my sites IP address to anopther in my range, however these domain names still point to my IP and whatever site I have put there.

Someone has said to me it is a form of phishing, but I dont know how they could have done this and whether I can somehow stop this happening. The domains that have kind of hijacked my IP are
ipinikoparan dot com
durmakyokyoladevam dot com

odd enough domain names, could someone have set this up and is it some kind of security risk?

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Unable To Establish Connection. License Server Hostnames Could Not Be Resolve

Nov 5, 2008

I got a new server from uk2, has whm but i just couldnt get the server to work, i changed hostname and made nameservers etc but couldnt get it to work i pointed ips to hostnames and everything no response, domain is and i havent used cpanel for 2 years now and i used to have alot of experience in it before these days i just stick to directadmin and other control panels.

I just need to ask a few questions and i need help too to get my server up and running as im losing alot of time and money here

i remembered when i changed hostname on whm i need to run this through ssh:
So i did, and this was the result:


login as:'s password:
Last login: Sat Nov 1 01:39:07 2008 from
root@server1 [~]# /usr/local/cpanel/cpkeyclt
Updating Internal cPanel Information........................................quer y failed: query timed out
[]: No working dig found!
Unable to establish connection. License server hostnames could not be resolve to IPs.
root@server1 [~]#

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Aug 29, 2008

i am having a problem getting a dedicated server running for Unreal Tournament GOTY. everytime i create a dedicated server i get this error in the console:

Log: AInternetLink Resolve failed: Can't find host (WSANO_DATA)
ScriptLog: UdpServerUplink: Failed to resolve master server address, aborting.

im running through a router.

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Plesk 11.x / Linux :: CentOS 6 - Host Name Must Resolve To Correct IP Address Of Server

Feb 15, 2015

I have a fresh server running CentOS 6 (final). I am trying to install Plesk 11.5.30 but i am experiencing some problems. When i run the plesk-installer i get this message:

Your host name must resolve to the correct IP address of your server, unless you are using network address translation (NAT).

Please quit Parallels Installer, fix the host name resolution problem, and then try installing again.

You can skip the hostname check and continue the installation, however, in such a case, the installer cannot guarantee successful installation.

Now, in my /etc/hosts file i have this: localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

Is this correct? Or do i need to add/change something else?

My server is in the clound.

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We are setting up 100s of new domain names every day. We are only hosting a simple blog, in fact with our current setup we are on a HostGator Reseller account and we are just using one account meaning one single cPanel account.

We have a script that automatically runs when people sign up for our service, this script sets up an addon domain on that same single cPanel account with the same document root. Our modified wordpress blog simply looks at the HTTP_HOST in the config file and opens a separate database tables for every new domain name.

The problem we are running into is not the bandwidth usage, nor storage space. But simply the mass addon domains. The cPanel adddomain.html script seems to be getting ran so many times it is overloading the web server.

So I have read about some other people here WHT that are starting to use a new server software that uses a lot less server resources then WHM and cPanel. So I am wondering what hosting companies can provide that sort of a server.


Storage: A couple hundred GB
Bandwidth: 1000s of GB
Server software to run PHP scripts and mySQL databases
Ability to create 1000s of addon domains every day.

Does this need to be an array of servers?

We are ready to get moving on a deal now.

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On Intel machines, after installing these RPMs, the binary that is to be run (/usr/sbin/hdacsd) fails with a "Floating point exception" so I'd like to find out if this is an issue caused by a 3DNow optimizations to these RPM binaries (Intel does not support 3DNow) or something else.

I've put up the RPMs at [url] and the main one to be installed is dacs-hybrid-3.0.0-7.x86_64.rpm

After installation, run hdacsd (possibly in /usr/sbin) and tell me if you get the floating point exception.

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and disable that ability for the rest.

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If you don't like this type of cab, which type do you like?

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Dec 29, 2007

I seem to keep getting this error whenever I try to uploading something thats too large.

It transfers fine for a few mins, then it stalls and eventually I get this error message.

Small files are fine since they don't take long to transfer, it just seems that I can't have a file transferring for too long.

I can actually get the damn file through but since I keep getting that error, I need to keep manually clicking on the transfer button. So it takes about 20 tries before I can finish a 30MB file. And I have a lot of files to transfer so thats very troublesome.

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Nov 5, 2009

We recently began to mirror a large number of open source projects with a dedicated mirror server on our network and I was surprised not only with how popular the mirror server has become, is, but also of the ability of the hardware we're using to keep up with the load.

At an given time, the mirror seems to be pushing at least 50 Megabits of trafficthe server is also an IRC server ( for customers and internal staff communications.

The hardware is a low end Dell Pentium 4 @ 2.66 GHZ server, running with 512MB of RAM and a 400 GB ATA hard drive. CentOS v5.3 is the operating system.

If you're interested, you can view the HTML logfile analysis here but that doesn't tell the full story as FTP users make up a good portion of the traffic. We've received over a quarter million hits in the first few days of November alone.

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The only change that I made to the default configuration was lowering the maximum number of Apache servers to 128.

Just thought I'd share this information as I wouldn't have thought a server with such a small amount of RAM would be able to serve up so much data, even though we are talking strictly static HTML files.

I'll definitely keep this in mind when clients ask me for those "what type of dedicated server should I use for XXX" type discussions that are had all too often with clients.

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Domain Does Not Resolve :: Domain Name Server (DNS) Issues

Aug 14, 2008

I've been having some DNS problems with one of my domains for quite some time now. The domain does not always resolve - some go days without being able to access the site.

I ran a simple BASH script to show what I mean. I replaced my domain with "" and the IP with "".

# for i in `seq 1 15`; do host; done has address mail is handled by 0
Host not found: 2(SERVFAIL) has address
Host not found: 2(SERVFAIL) has address
Host not found: 2(SERVFAIL) has address
Host not found: 2(SERVFAIL) mail is handled by 0 has address
Host not found: 2(SERVFAIL)
Host not found: 2(SERVFAIL) has address
Host not found: 2(SERVFAIL) mail is handled by 0 has address mail is handled by 0 has address mail is handled by 0 has address mail is handled by 0 has address
Host not found: 2(SERVFAIL) has address mail is handled by 0 has address mail is handled by 0 has address mail is handled by 0 has address mail is handled by 0

Has anyone experienced a similar problem? I have gone over the DNS records countless times and see no problems. The site is hosted on my own dedicated server.

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Aug 7, 2008

What is the best, stable and free dns resolver ips for shared hosting servers?

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I am new to the dedicated servers. I have just upgraded myself to a dedicated machine.

I am getting error "couldnt resolve host" at every domain name when I type like


I searched over internet and found some people telling that I should put nameserver to /etc/resolv.conf?

nameserver <ip here>
nameserver <ip here>

I dont know what IP to put here or if it is a solution to my problem.

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Hostname Does Not Resolve To Any IP

Oct 31, 2009

I hope your day is going good. I've been trying to fix a problem I had all week. I receive daily email notification that "example.[url]" does not resolve to any IP. However, when in WHM, it already contains Server Main Ip: I've tried a few solutions from the web, but to no avail:

IMPORTANT: Do not ignore this email.
The hostname ( resolves to . It should resolve to Please be sure to correct /etc/hosts as well as the 'A' entry in zone file for the domain.

Some are all of these problems can be caused by
/etc/resolv.conf being setup incorrectly. Please check this file if you
believe everything else is correct.

You may be able to automaticly correct this problem by using the
'Add an A entry for your hostname' under 'Dns Functions'
in your Web Host Manager

1) Within WHM, I have the following:

-Add an A entry for your hostname (I only have one listed)
Server Main Ip:

-Primary/secondary nameserver
Primary Nameserver: (A entry =
Secondary Nameserver: (A entry =

-Resolver Configuration
Primary Resolver:
Secondary Resolver:

-Additional IP my webhost gave me to use: (used in primary name server) (used in secondary name server)

-Current DNS Zone listing: (my website URL that is currently working) (hostname I made myself that contains the server main IP) (A entry = (A entry =

2) My edit "edit /etc/resolv.conf" contains the following:
Search localdomain

Issue: I receive daily email notification that "" does not resolve to any IP. However, when in WHM, it already contains Server Main Ip:

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I have gone through all the nameserver files (I can think of or have read about) looking for something that may be causing this but everything looks normal.

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I have nameservers setup on my server. As I have changed my servers, I need to resolve the sites. I changed the nameservers Ips to resolve to new one: and

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And similar report by dnsreport is being given saying that NS didnt responded timely.

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Similarly in web browser I write server IP it gives cpanel page but on same computer I write [url]I get page cannot be opened, when I refresh the page at certain times then it would open. Now once it is opened in the same computer it would work fine here.

In some internet connections it works fine i.e no problems, in some connections get similar problems that domains does not resolve properly.

I checked my named service works fine.

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