Ubuntu

16.04 installation gives server not found error in browser

Asked by Harmen

Hi,
Recently I switched from Ubuntu 14 to 16.04. Ever since I have problems visiting several webpages.
Last time I tried e.g. my e-mail, first time it works (after PC startup) second time it does not.

This is using the default browser, no change to default settings of Firewall. No changes in computer or hardware.

What can be the problem? If I need to post some guiding info, please suggest what and by which command.

Bye,

Harmen

Question information

Language:
English Edit question
Status:
Expired
For:
Ubuntu Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

Can you ping your router's internal IP?
Can you ping 8.8.8.8?
Can you ping BBC.co.uk?

Thanks

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#2

Have you rebooted your router? Leave it off for at least 30 seconds.

Revision history for this message
Harmen (harmen-rooms) said : 		#3

Ping Test both before and after rebooting the router shows some erratic behaviour.
Ping router shows
4 packets transmitted, 4 received, 0% packet loss, time 3004ms

Ping 8.8.8.8 shows also normal
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=49 time=12.4 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=49 time=10.1 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=49 time=11.6 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 10.143/11.409/12.449/0.958 ms

First www.yahoo.com shows no problem. Later it shows suddenly:
ping:unknown host www.yahoo.com.
In the browser same happens, that one time a page will load and the next it will not.

Rebooting router does not change this.

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#4

OK then run:

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null

Then is the web access OK?

Thanks

Revision history for this message
Harmen (harmen-rooms) said : 		#5

Nope, still not. Problem persists.
I also see that the apt-get upgrade for nl.ubuntu.archive fails. :-(
funny is that not once I had problems with reaching the launchpad website.

Thanks

Revision history for this message
Harmen (harmen-rooms) said : 		#6

OK, so now that I'm on a totally different modem and even in a different country (Germany instead of Netherlands) I have not trouble in viewing websites at all.
I will try again in NL later on a different router than my own and report back.

Revision history for this message
Harmen (harmen-rooms) said : 		#7

Well, it seems that the "bug" is only present on my router.

To summarize again:
- On Ubuntu 14 I had no problem
- Switch to 16 gives "server not found" also updating from nl.archive.ubuntu does not work\
- both when using LAN and WLAN
- Connecting within other networks (other modems) does not give this problem

I guess this is some kind of using a wrong DNS lookup table, but then still the question is why does this only happen from my home router and only in Ubuntu 16.04.

Revision history for this message
Launchpad Janitor (janitor) said : 		#8

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Revision history for this message
Harmen (harmen-rooms) said : 		#9

Well, I would still need an answer, but since it also has to do with my provider, I will try to find out the problem myself.
Weirdest thing is that after
dig
host
traceroute

the server responds....

Thanks for the help so far.