Ubuntu :: Unable To Configure Ip Address - Unknown Host.

Aug 10, 2010

this issue which has suddenly occurred on both my Desktop and my Laptop. When I try to configure an IP address to any interface I get the following error....

uadmin@Ubuntu:~$ ifconfig br0 addr
addr: Unknown host
ifconfig: `--help' gives usage information.

I get this for ethernet interfaces as well. I do not understand what is different as I was able to configure the ip address only the day before yesterday on the laptop..? The Desktop has had this issue for about 3 weeks now.

br0 Link encap:Ethernet HWaddr 32:70:40:91:06:25
inet6 addr: fe80::3070:40ff:fe91:625/64 Scope:Link
RX packets:0 errors:0 dropped:0 overruns:0 frame:0


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Networking :: Unknown Host - Placing Eth0 In Dhcp Through The GUI And Bash But Always Get A 169 Address Or 127

Jan 22, 2010

I'm having an issue configuring eth0. I'm using ubuntu 8.10 in a virtual machine (VirtualBox). The correct adapter is being used and it has worked in the past. I've tried placing eth0 in dhcp through the GUI and bash, but always get a 169 address or 127.

When I run the following command:


The output is:


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Server :: Host Unknown Error:Sendmail / Stat=Host Unknown (Name Server: Def-fgh.com.: Host Not Found)?

Sep 8, 2009

Many of mails sent from my mail server that are in Queue;The main reason is deffered by domains like yahoo,aol,etc.but there is one more error that i keep getting and that is Host Unknown,Below is an example from mail log,The catch is,test mail sent on the same email id sent from my personal mail from the same server i.e. url was deliveredHowever,another mail containing client information sent from customercare@mycompanysdomain ended up in queue.

There are more examples of the same,around 20 domain have the same problem.

Sep 7 14:33:46 server2 sendmail[24591]: n8793jiC024589: to=<abc@xyz.fi>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=163672, relay=xyz.fi., dsn=5.1.2, stat=Host unknown (Name server: xyz.fi.: host not found)

Sep 7 22:09:42 server2 sendmail[6407]: n87Gdffa006403: to=<abc@def-fgh.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=152474, relay=def-fgh.com., dsn=5.1.2, stat=Host unknown (Name server: def-fgh.com.: host not found)

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Server :: Configure Apache To Host 5 Domains As Virtualhosts In The Same IP Address?

Jun 2, 2011

I've been for a while trying to configure my apache to host 5 domains as virtualhosts in the same IP address, but seems that neither one makes it through... it always takes first one, because it is the default:

NameVirtualHost *:80
<VirtualHost *:80>
ServerAdmin xxxxxxx@xxxx.net


As you can see I tried the ServerName with the http://, in quotes, without it...

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General :: Ping - Gives Unknown Host Error - Ping To LAN Address Works Fine

May 13, 2011

Even ping google's ip address doesn't work. unknown host error using backtrack4 able to browse net with these settings.

My network settings:

What's the problem with these settings...

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Networking :: Debian 5 - After SysCp Installation And Configure Ping Valure - Ping - Unknown Host

Jul 9, 2010

Ive got a problem on my server ....installed Debian 5 , Webmin and than syscp settung up syscp ready ....

I try to ping "localhost" ansver ping: unknown host
I try to ping "localhost." there is a host with IP

I need it to change it in "localhost"

Is that the bind9 maybe?

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Slackware :: Unable To Resolve Host Address `dls.urt.voxel.net'

Jul 17, 2010

when tring to install (AssaultCube, UrbanTerror) i get this: unable to resolve host address `dls.urt.voxel.net'

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Programming :: Unable To Fix Syntax Error In Finding Ip Address Of A Host Name?

Apr 27, 2010

Writing a program that finds the IP address of a host name. Sorry forgot to include the line numbers, but where the $$$ is where the syntax error is. The errors are syntax error before "{" token and syntax error before "if". I've looked throught the code for a couple hours and can't figure out what's causing it. The code is attached below.

#define WIN
#include <stdio.h>
#include <stdlib.h>


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Networking :: 'Unable To Resolve Host Address' Errors With Newer Distributions

Mar 10, 2010

I'm trying to troubleshoot some strange networking problems. The pattern seems to be that only newer distributions are affected. CentOS 5.4 and Ubuntu 8.04 work fine out-of-the-box. But Arch, Sidux, AntiX, Fedora, etc. show the same pattern of errors.Certain websites cannot be found unless I disable ipv6 in Firefox. And certain addresses cannot be resolved using various terminal commands (wget, apt-get, yum, etc.). What I would ideally like is a permanent solution, perhaps changing some settings on my router, so that I don't have to deal with this each time I test-drive a new distro. I have a hunch the issue has something to do with my DSL provider (Fairpoint) filing for bankruptcy.

One more piece of information that may or may not be relevant: I recently switched a website from one hosting company to another. I noticed there was a delay of several days where I saw the old version at the old host, but viewing the site at a friend's house or the coffee shop showed the new site on the new host. This leads me to suspect DNS issues perhaps, but this is not an area of expertise.

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General :: Get The Ip Address Of Host Using Of Host And Nslookup Command?

Oct 20, 2010

HOW TO GET THE IP ADDRESS OF HOST IN LINUX WITH USING OF HOST AND NSLOOKUP COMMAND and after getting the ip address how to assign it in the variable

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Ubuntu Networking :: Can't Ping URL - Unknown Host

Apr 5, 2010

I am using ubuntu 9.10 and I still cannot figure out this thing. I work behind a proxy managed by my university. Now, I cannot ping the other users on my network although they can ping me. Not to mention, I also cannot ping [URL]... It says : ping: unknown host [URL]... But I can ping the proxy server.

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General :: Hostname: Unknown Host

Jan 15, 2010

I am installing ISPconfig on a Ubuntu server 9.10. When i write hostname -f i get the unknown host message.

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CentOS 5 Server :: Using ISP With DCP - Unknown Host

Mar 24, 2010

I am using comcast ISP with DHCP.

When I type in hostname -f it says unknown host
in /etc/sysconfig/network
in /etc/hosts servix.mydomain.com localhost localhost.localdomain example.com www.example.com
in /etc/resolv.conf
search servix.mydomain.com

In linksys router I have host as servix and domain as example.com. So why is it returning unknown host?

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Ubuntu Networking :: Dig Works But Ping Shows 'unknown Host'?

Dec 4, 2010

I've encountered a problem after doing a fresh install with xubuntu 10.10 (2.6.35-23-generic).some sites are blocked like [url]....if I do dig [url]....- I receive the A, CNAME records and the IP address and everything.when ping[url].... - I receive 'unknown host'.when ping <theipaddress> - I receive responses

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Fedora :: Konqueror Unknown Host Error

Jul 25, 2011

When I open Konqueror, on Fedora 15 KDE, it opens to the default Start Page just fine. When I try to visit any other website, it gives me an Unknown Host Error. The documentation I found for KDE just said that if I get that error, it means that either the website does not exist or I am not connected to the internet, but I'm quite sure I'm connected to the internet.

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OpenSUSE Network :: Name Lookup DNS - Unknown Host

Jan 8, 2010

I can lookup DNS hostnames with dig and nslookup, but nothing else seems to be able to resolve anything. ping, telnet, Firefox, everything gets "unknown host".

For example:
> dig yahoo.com
; <<>> DiG 9.6.1-P2 <<>> yahoo.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20438
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 13, ADDITIONAL: 0



> ping yahoo.com
ping: unknown host yahoo.com
> ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=55 time=97.2 ms
64 bytes from icmp_seq=2 ttl=55 time=98.9 ms

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Ubuntu Security :: NMap Lists Unknown Local IP Address

Jul 18, 2010

I wouldn't call myself paranoid, but I do try to keep reasonably secure on my home network (WPA encryption, router firewall, etc.). I also occasionally use nmap to make sure I don't see any unknown computers logged into my network. The problem is I have five computers that all use DHCP on the network and they are not all up all of the time. At most, there are two to three online at any one time.

So, my question is: Do any of the IP addresses remain in the router's database for a computer that has gone offline (shutdown)?

The reason for my question is that today I ran nmap on my home network and noted an IP address that was not currently up on the network. It is, however, an address that is frequently assigned to one of the computers when it is online, but that address was not up at the time I ran nmap. Just trying to make sure my network is not being used by some nearby computer.

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Fedora Servers :: Gnome Error - Hostname: Unknown Host

Mar 23, 2009

I installed Gnome on my server by when I run


[root@F026 ~]# startx


hostname: Unknown host
xauth: creating new authority file /root/.serverauth.2915
X.Org X Server 1.5.3
Release Date: 5 November 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.18-128.1.1.el5 i686


I don;t have physical access to the system and it is a server located in Europe. Fedora release 10 (Cambridge) is installed in it.

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Programming :: Script To Find Local IP - Output Unknown Host

Nov 24, 2010

I want to find out my IP and I test this code from beej tutorial:

char hostname[128];
int i;
struct hostent *he;
struct in_addr **addr_list;
struct in_addr addr;

gethostname(hostname, sizeof hostname);
printf("My hostname: %s
", hostname);
he = gethostbyname(hostname);
if (he == NULL) { // do some error checking
herror("gethostbyname"); // herror(), NOT perror()
return 1;
} // print information about this host:
printf("Official name is: %s
", he->h_name);
printf("IP address: %s
", inet_ntoa(*(struct in_addr*)he->h_addr));
printf("All addresses: ");
addr_list = (struct in_addr **)he->h_addr_list;

for(i = 0; addr_list[i] != NULL; i++) {
printf("%s ", inet_ntoa(*addr_list[i]));
return 0;

But my output is this:
My hostname: vBx
gethostbyname: Unknown host

I heard that it works in windows, why isn't working in linux?

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Server :: Samba On Redhat 9.0 Shows An Unknown IP Address?

Jun 30, 2010

I am running RedHat 9.0 on a VMware on Window XP, I have bridged the network card eth0 such that
I can ping the host machine and the Windows XP machines on my LAN.

I managed to set up the samba server on this Redhat 9.0, And I can see the netbios name on my WindowXP: Rhl machines. Now I want to reach the Windows machines vi sambaclient but I get an Ip address that is not on my network - did not set this IP address.

This is the message I get when I run smbclient so that I can reach windows machine when I am on Redhat:

# smbclient //machine name/name of user on windows machine
added interface ip= bcast= nmask=
Got a positive name query response from (
error connecting to (Network unreachable)
Error connecting to (Network is unreachable)
Connection to machine name failed

My question is Where does IP address come from. Where must I look in order to remove it ( in Linux or Windowx Xp.

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General :: Get Only Ip Address Of Host?

Oct 20, 2010

my problem is when iam typing

a=host test.com
echo $a
test.com has address

now i want to print only address ( and don't want to print this line [[URL] has address] how to do this

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Networking :: Some Other Host Already Uses Address?

Oct 17, 2010

I am setting up a server, with a static IP address. I thought I did the setup correctly, including setting up the static IP address. When the system restarted, I saw a message flash about some other host already uses address 72.86.26.xxx

Then, once logged in, I got a system message: System is not receiving updates, check network connection.

I went to System: Network Configuration, and under Devices, I saw:

Inactive Device: eth0

I clicked on activate, and I received the same message: some other host already uses address 72.86.26.xxx

The file /etc/sysconfig/networking/devices/ifcfg-eth0 reads:

#realtek Semiconductor, Ltd. ...


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Oct 28, 2009

I have a Fedora box running a domain and a sub domain. It also is the mail server running Postfix and Dovecot. I have created a new user account in the Virtual Alias.conf file and run postfix reload.

"e.g [URL] admin_company"

This new account can send mail internally and externally but cannot receive mail internally and externally.
The error message internally is: 5.1.1 <admin@threadneedle.com.pg>: Recipient address rejected: User unknown in virtual alias table

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Ubuntu Networking :: Host Website With Dynamic IP Address With NAT?

Nov 6, 2010

We have Verizon as our ISP with a dynamic IP address. We published our website but the IP changes frequently. How can we set Network address translator(NAT) so our website can be published regardless of IP changes? We don't have domain name and have no intention for one.

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Ubuntu :: Change Ip Address - Get This,The Authenticity Of Host ' (' Can't Be Established?

Aug 9, 2011

I changed my ip address to a static one. Hope did it correctly. Now when I try to ssh or sftp I get this.The authenticity of host ' (' can't be established.RSA key fingerprint is 6b:31:28:58:ee:2b:77:36:08:64:a1:33:85:3c:f1:1f. Are you sure you want to continue connecting (yes/no)?

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Ubuntu Security :: Postfix - Not Critical - SMTP Server: Errors From Unknown [ip Address] In Local Recipient Table

Jan 2, 2010

This is a transcript I get emailed at least once every day, usually about 3 to 10 a day recently.

Transcript of session follows.
SMTP server: errors from unknown[ip address]
<boring stuff snipped>
In: RCPT TO: <server@my domain>
Out: 550 5.1.1 <server@my domain>: Recipient address rejected: User unknown in local recipient table

Session aborted, reason: lost connection Now I cannot seem to find anything via Google, as when I put "server@" anywhere in the string, I just get web hosting or other kroomst. The emails usually come from legit places, usually hotels. Does this mean they are sending bad emails, i.e. they have a Trojan/worm, or is this a live hack attempt?. I believe the later, as I might get upto 3 domains from the one ip address, which is always, NOT associated with the listed domain. Not causing me any issues, except I have been getting a lot recently.

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Fedora :: Resolving Host Name To IP Address?

Jan 25, 2011

I am using Fedora 7 in my server. Currently windows server 2003 (Active Directory integrated with DNS) is running. I want to switch my DNS to Linux. In my small organization there are only 20 users using static IP address and the IP are mostly permanent. so should deploy name server or I just populate eateries in /etc/hosts file ?

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Networking :: SSH Working Via IP Address But Not Host?

Feb 3, 2010

This is a fun one (x used in place of real IP's and hostnames):

$ host 134.174.xxx.xx
xx.xx.174.134.in-addr.arpa domain name pointer xxx.xxx.xxx.com.
$ host xxx.xxx.xxx.com


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Networking :: What Is Command To Show Host Name Of Ip Address?

May 25, 2010

What is the command to show the host name of the ip address?Suppose, I've an ip address like, now I want to know its host name.What is the command for that?

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General :: Where To Find Host In Order To Put IP Address

Mar 27, 2010

a friend created an IP address for me.where do I find the Host in Linux in order to put the IP address.

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