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A couple of days ago I was working with ipython notebook and it opens me a page in my web browser (Google Chrome) and I was able to work with the notebook (zero problems with my internet).

Then, I configure my network connection with a public proxy in order to get access to a blocked webpage, after that I erase the proxy configuration.

Now, when I open the ipython notebook I get the next error:

ERROR: Not Found

While trying to retrieve the URL http://some.localhost:8888/tree:

DNS resolving failed

Your cache administrator is webmaster.

Moreover, I have been having internet connection problems, for instance, I have to reload several times a webpage in order to open it, most of the times I get a No internet error despite I am connected.

So, the question is: How I get rid of this DNS error?

Additional comments: I am in Ubuntu 12.04. I am having this problem in my workplace as in my home, therefore I believe it has to do with my network configuration and not with my router.

I don't know which should be my default configuration since I don't know too much about networks, but I have the following configuration in /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1
search some.workplace.page

The file gedit /etc/network/interfaces have:

auto lo
iface lo inet loopback
# The primary network interface  
auto eth0

I tried to flush the DNS as explain in here but that didn't work.

ifconfig eth0 gives:

eth0      Link encap:Ethernet  HWaddr 54:42:49:58:36:xx  
UP BROADCAST MULTICAST  MTU:1500  Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
Interrupt:18
Community
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Jorge
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  • Try this command in your Terminal: sudo echo "nameserver 8.8.8.8" >> /etc/resolv.conf – Naveen Sep 08 '14 at 16:40
  • @Naveen: I got bash: /etc/resolv.conf: Permission denied even though I can edit /etc/resolv.conf with sudo – Jorge Sep 08 '14 at 16:57

1 Answers1

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Your current /etc/resolv.conf expects a local (stub) resolver, so check that the resolver is actually running: sudo netstat -unlp | grep :53 should report at least one line of the form

udp        0      0  127.0.0.1:53    0.0.0.0:*       776/named

If not, you may need to restart the bind9 service (sudo service bind9 restart) or to change the nameserver line in /etc/resolv.conf to point at a known-good resolver: either your router (probably 10.0.0.1 or 10.1.1.1 or 192.168.0.1), or one supplied by your ISP, or a public one such as Google's 8.8.8.8.

Martin
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  • I believe this partially works! I am not getting the DNS error and I can surf through the internet with the browser, but now, programs like spotify or dropbox can't connect. do you know what could be the problem now? – Jorge Sep 10 '14 at 00:39