Ubuntu Servers :: WAN IP Address Wont Resolve?
Feb 18, 2010
Ubuntu Server 9.10, with apache, proftpd, mysql and the goodies.
I have wordpress installed and setup under /var/www/
The LAN IP address resolves perfectly to the index.php
However I can not get my WAN IP to resolve. My ISP blocks port 80, so I have my router setup to forward port 81 externally to port 80 of my server. I know the port forwarding is setup correctly and working, because I can go to websites like url and test that port 81 is indeed open.
I also have DynDNS setup on my router and through an account with them, to update my IP address with any changes, to a host name. But because port 80 is blocked I have to access it with, host.name.org:81. Ive had this system up and running before with no issues. Now I can not get the host.name.org:81 to resolve.
Neither can I get my ip address xx.xxx.xx.xxx:81 to resolve.
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Feb 17, 2011
In firefox you can type ubuntuforums and it will bring you here via a google query.Mines stopped working the address bar goes to http://ubuntuforums/ and I get a forbidden page.I've check about : config and all is set fine
Code:
Keyword.enable = true
Keyword.URL = http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=
[code]....
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Jul 14, 2011
This morning it would not boot; when I tried to wake up the system, it gave me a bunch of errors, the last ones being as follows: "mount error: could not resolve address for servername: No address associated with hostname mountall: mount /media/shares [1402] terminated with status 1" I am writing this in Win 7 since I lost ubuntu. I am using ubuntu 11.04.
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May 28, 2010
I have to build a netwrok for small lab and office setup.Setup as belowI have a PC running with Centos 5.4 and has 4 NIC cards. eth0, eth1, eth2 and eth3
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Nov 17, 2010
I have an odd thing going on with DNS. I have two machine's running Ubuntu and for some reason they do not always resolved internet addresses on my Internet connection. This has gone on since the Ubuntu 8.04 when I first started using Ubuntu. Anyway, I use OpenDNS' DNS servers and I have been running perfectly.
This is what is odd. My Windows XP Machine never has the problem. It always resolves. Does Windows Possibly have some Microsoft hosted DNS server hard coded in there as a backup? Things are working fine this way so I am not looking to change. I am just a little puzzled and finally got around to asking, "Why is this".
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Jul 26, 2011
I just changed my CentOS server from DHCP to static IP address. After the change, I cannot ping other hosts on the same subnet. (I can ping the CentOS itself).The IP address of CentOS is 192.168.0.202.After pinging 192.168.0.106 (106 is on and other host can ping it), arp -a shows? (192.168.0.106) at <incomplete> on eth0 It looks ARP cannot resolve MAC address of hosts 192.168.0.106.
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Oct 4, 2010
I'm having really weird and frustrating DNS issues with my clients unable to properly resolve the server's ip address. They can resolve each other's, and outside systems, but not the server - at least, not correctly, and not all the time.
I have one Ubuntu server set up that does both DHCP and DNS serving to the Windows systems. The server has DNS forwarding turned on to forward to OpenDNS's servers (I've tried using my ISP's dns servers but the problem remains).
The server is *not* set up as a firewall; I am actually using a DLink router for that, and the Dlink is *not* set up to serve up DHCP nor DNS.
What I am getting is that my clients - and there are nothing but Windows clients - will not resolve the name of the server. For example, if I do: ping linuxserver
I get back a false IP address of 192.168.0.64 (and I've seen once a 192.168.2.49).
If, however, I put a dot in there: ping linuxserver.
I get back the *correct* IP address of 192.168.0.2, and thereafter, ping'ng linuxserver without the dot will work. Until the dns cache expires, either naturally or with ipconfig /flushdns on the windows clients.
The client *are* getting valid dhcp leases and can resolve everything happy-happy, they just will not get the proper address of the server 100% of the time.
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Oct 25, 2010
Here is a glimpse of my IPTABLES
http://pastebin.com/WvHAC46A
I see in the column of sources the addresses being resolved to domain names is there a way I can stop this?
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Jul 6, 2011
Centos 5, After switching out server to another provider the website responds as it should but the server is unable to establish connections to remote servers. Yes the internet connection is fine, I'm actually working on the server remotely.
--- 4.2.2.2 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 2999ms
/etc/resolv.conf has opendns nameservers
nameserver 208.67.222.222
nameserver 208.67.220.220
search localdomain
and I've updated /etc/sysconfig/network to reflect the new IP address.
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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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Jul 20, 2011
what is Production IP address and Management IP address in Linux servers? What is the significance of these two? When to use what?
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May 21, 2010
How do we configure to resolve for hostnames when an IP address is provided to the DNS server.
Things I tried
The DNS daemon was started by the resolution failed. Find the logs below
** server can't find 11.127.168.192.in-addr.arpa: NXDOMAIN
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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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Jan 30, 2011
Is it possible to run two servers through one ip address? And I don't mean through apache to run virtual servers. Right now my set up is: Cable modem>router>server.
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Mar 3, 2010
I have two computers.
Computer A = windows 7.
Computer B = Ubuntu Server 9.10
Computer B automatically receives an IP address from my router.
I can ping computer B from computer A using the IP address. I cannot ping computer B from computer A using its hostname.
My router did not show a hostname under it's active clients table. After some searching I found a threat where somebody suggested modifying /etc/dhcp3/dhclient.conf and adding 'send hostname "blahblah"' This allowed me to see the hostname in my router but I still cannot resolve it from my windows box.
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Apr 30, 2011
Topic says it. Postfix was receiving emails just fine on 10.10, did the upgrade, now every host is unkown...even though I can dig -x from the machine and resolve.
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May 25, 2010
I just built out an Ubuntu Server 10.04.
My problem is setting the hostname. I cloned the machine, then normally on the clone, I would change the /etc/hostname and /etc/hosts file.
However, when I do this, upon restart, I get the message, "init hostname main process (some process number) terminated with status 1"Then, when the machine finally boots, the hostname is set to (none). Literally has braces like: user@(none):
I've tried: sudo hostname machine_name but it says can't resolve hostname (none).
I've Google'd around a lot but can't get it. It may have something to do with 10.04? I have been using 9.04, 9.10 with no problems.
eric@(none):~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
code....
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Oct 6, 2010
I'm with Linux 2.6.32-25-server #44-Ubuntu SMP Fri Sep 17 21:13:39 UTC 2010 x86_64 GNU/Linux , Ubuntu 10.04 Server
And I wanna execute the next script in bash profile code...
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Sep 1, 2011
I've searched the interwebs and have never had this problem before but I can connect with ssh no problem. The problem arises when I try to connect with sftp. I get code...
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Feb 11, 2010
my local server here is not reachable when I type on the hostname so I am wanting to know if I am on the machine via ssh (I have a monitor and keyboard plugged into the tower)
How do I figure out what the servers IP address is? I have ubuntu server 9.10 and I looked at the etc/host, etc/hostname files and they have the correct server hostname
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Jul 22, 2010
I've just installed Ubuntu server 10.04 and have set up vsftpd somewhat successfully. I can connect as my root user, and I only have access to my home directory. However, whenever I try to copy a file across a file I receive a 550 Permission denied error.
I've run the command ls -l /home/directory and the result returned is total 0, when I was expecting details of permissions per user. I've tried running chmod -w /home/directory but this doesn't return any result nor change the result of the above ls command.
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Aug 8, 2010
After rebooting, I found that the server couldn't see the network. The machine has dual gigabit ethernet (eth0 and eth1). eth0 is connected to the internet, but disappeared. ifconfig used to show eth0, eth1, and lo, but now only shows eth1 and lo. If I boot into rescue mode I can get internet and ifconfig returns eth0 and lo. Any ideas on how to fix this?
I apologize in advance if I ask any noob questions. I'm not a very experienced Linux user.
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Jul 11, 2011
I've installed apache2 on ubuntu 10.04 and everything works fine, but when I use functions that needs to connect to Internet, it doesn't work. Is there a simple setup I've forgot? I've been searching and looking for a solution, but I'm stuck!
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Aug 16, 2011
I am suddenly not prompted for my password when I run any command as sudo on a few of my Ubuntu servers.
if I run sudo -K, the session is cleared, and I am prompted again for my password, however it saves/caches it until I run sudo -k again even if I log out and back in. I want it to prompt me for my password, as it should (and did) by default, for security.
Any ideas what could be causing this?
Here's my /etc/sudoers file code...
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Aug 26, 2009
I set up a website in my home directory, which works fine except running some .cgi scripts. the suexec.log shows this error message :
"cannot get docroot information (/home/weixi)"
does anybody have any suggestion what's wrong with it? I use Fedora 11.
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Apr 29, 2011
When I set my DNS servers via Yast>Network Devices>Network Settings>Hostname DNS it accepts the addresses, but then when I check then the next time they are faded out. I set them again, but same results.
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Aug 11, 2010
Been trying to upgrade home server for several days and it keeps hanging on the mysql upgrade. Here's the what apt-get says code....
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Nov 2, 2009
Recently my home PC crashed and I had to re-installed it. I put a "clean" install of Fedora11, then copied my /home directory and some other stuff over from the old installation.I have a couple of PHP scripts I wrote, and one of them stopped working. It uses cURL, and when I enable error tracking I get:cURL error number:6cURL errorouldn't resolve host 'www.host.com'I started digging around and I found out Apache doesn't resolve anything at all, so it's not only a cURL problem. For example,
$ip = gethostbyname('host.com');
echo $ip; die();
returns "host.com" and not an IP address.My best guess so far is that Apache has no access to the DNS service (from command line and in browsers everything resolves). had a suspicion it's a SElinux issue and disabled it, but that didn't change anything.I found some old forum posts mentioning problems with chroot-ed Apache, but I haven't done anything to mine and in any case couldn't figure out what the problem was, or the solution, so I'm stuck.
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Apr 9, 2010
Anyone can point me to a document, page, or something that will tell me exactly how to implement DNS step by step. I don't mean just the concept, i.e. you'll need two name servers, and to download BIND, etc. NO, I mean command line commands and all. Step 1, step 2, how to register the name servers, how to resolve different domains, etc.
I'd really appreciate it, as I need to implement internal DNS and external DNS for my company soon. Our set up is pretty standard: Firewall, DMZ, Solaris/Linux/Windows servers, and Windows clients, etc.
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Jan 18, 2011
I have setup a home based web server to host a photo blog for myself and my friends. I will be running wordpress and possibly a phpbb3 forum. I'd like to open this to discuss server administration, server setup, and server maintenance. However, I have a pretty good start on all of those but serving a domain name to my static ip. Here my static ip is 24.10.202.144. I registered a domain through [URL]... It appears that I have the domain working to forward to my ip. However, I am still getting this output file from apache.
[code]...
I have tested the domain name across a few different computers on different ips. It works appropriately. I just want to make sure I have it set correctly on the (apache) server side of things. Then I can get more into Zone Editing etc.
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