[SOLVED] Firefox - Server Not Found

rafdre · 2017-04-10 17:25:15

Hi all,
Ater my last system upgrade (though I am not 100% sure it started at this time), which was one week before - I observe very strange behaviour in Firefox.

All pages work fine, but some not.
Good example is "www.ibm.com". When I try to open it I see this;

Server not found
Firefox can’t find the server at www.ibm.com.
Check the address for typing errors such as ww.example.com instead of www.example.com
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

In the beginning I thought it might be that IBM page is redirecting me to HTTPS , but bbs.archlinux.org is also HTTPS and is working fine (this post is evidence for it).

I have no clue what can be the issue.

I tried to work with traceroute , but it does not work for www.ibm.com though it works fine for google page. See this:

[root@zotac rafal]# traceroute www.ibm.com
www.ibm.com: Name or service not known
Cannot handle "host" cmdline arg `www.ibm.com' on position 1 (argc 1)

[root@zotac rafal]# traceroute google.com
traceroute to google.com (216.58.214.238), 30 hops max, 60 byte packets
 1  gateway (192.168.1.1)  0.747 ms  1.133 ms  1.313 ms
 2  10.246.0.1 (10.246.0.1)  10.200 ms  13.477 ms  13.554 ms
 3  172.17.220.113 (172.17.220.113)  13.763 ms  13.818 ms  13.862 ms
 4  172.17.28.198 (172.17.28.198)  15.201 ms 172.17.28.238 (172.17.28.238)  14.948 ms 172.17.28.198 (172.17.28.198)  14.720 ms
 5  172.17.28.238 (172.17.28.238)  14.266 ms  14.338 ms  13.969 ms
 6  031011202146.p2p.business.static.vectranet.pl (31.11.202.146)  13.644 ms  7.683 ms  12.801 ms
 7  66.249.95.15 (66.249.95.15)  12.253 ms  6.443 ms  9.852 ms
 8  74.125.37.94 (74.125.37.94)  23.254 ms  32.339 ms  23.481 ms
 9  66.249.94.183 (66.249.94.183)  23.546 ms  23.177 ms  23.478 ms
10  bud02s24-in-f14.1e100.net (216.58.214.238)  22.225 ms  21.935 ms  25.656 ms

help posted here https://support.mozilla.org/t5/Unblock-Firefox-from-connecting/Server-Not-Found-Troubleshoot-connection-problems/ta-p/3043#w_cannot-load-websites-after-updating-firefox does not help.
I have deleted CACHE and did what is described on that page.

I do not think Firewall can be an issue. I am using ufw and when I stop it I see the same issue.

what can be a root cause?

regards
Rafal

Last edited by rafdre (2017-04-15 09:34:50)

rafdre · 2017-04-10 17:28:38

I have checked traceroute without "www'. Here is outcome

[root@zotac rafal]# traceroute ibm.com
traceroute to ibm.com (129.42.38.1), 30 hops max, 60 byte packets
 1  gateway (192.168.1.1)  0.679 ms  1.226 ms  1.463 ms
 2  10.246.0.1 (10.246.0.1)  7.705 ms  11.386 ms  11.484 ms
 3  172.17.220.113 (172.17.220.113)  12.874 ms  12.963 ms  13.032 ms
 4  172.17.28.190 (172.17.28.190)  13.483 ms 172.17.28.194 (172.17.28.194)  13.260 ms 172.17.28.190 (172.17.28.190)  13.472 ms
 5  172.17.28.194 (172.17.28.194)  11.799 ms 172.17.28.190 (172.17.28.190)  12.190 ms  11.878 ms
 6  dialup-212.162.18.229.frankfurt1.eu.level3.net (213.242.117.229)  25.141 ms  20.524 ms  20.046 ms
 7  ae-11-vl-3101.edge3.London2.Level3.net (4.69.202.170)  51.850 ms  51.960 ms  52.030 ms
 8  ATT-CORP.edge3.London2.Level3.net (195.50.91.226)  55.208 ms  54.645 ms  55.248 ms
 9  * * *
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rafdre · 2017-04-10 20:03:54

I need to add that I have second PC in the same network. It also has ARCHLINUX and Firefox and there everything works fine.
I can open IBM page without issues.

Here what traceroute shows me on that PC

[root@localhost NOWA-WERSJA]# traceroute ibm.com
traceroute to ibm.com (129.42.38.1), 30 hops max, 60 byte packets
 1  192.168.1.1 (192.168.1.1)  1.019 ms  1.359 ms  1.670 ms
 2  10.246.0.1 (10.246.0.1)  12.857 ms  18.241 ms  18.410 ms
 3  172.17.220.113 (172.17.220.113)  18.843 ms  19.020 ms  19.171 ms
 4  172.17.28.190 (172.17.28.190)  19.920 ms 172.17.28.194 (172.17.28.194)  20.265 ms  20.395 ms
 5  172.17.28.190 (172.17.28.190)  19.585 ms  19.753 ms 172.17.28.194 (172.17.28.194)  20.085 ms
 6  dialup-212.162.18.229.frankfurt1.eu.level3.net (213.242.117.229)  36.452 ms  23.908 ms  27.940 ms
 7  ae-11-vl-3101.edge3.London2.Level3.net (4.69.202.170)  57.042 ms  56.895 ms  56.692 ms
 8  ATT-CORP.edge3.London2.Level3.net (195.50.91.226)  62.739 ms  62.243 ms  62.425 ms
 9  * * *
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where can be a problem ?

brainfucksec · 2017-04-12 17:26:16

Almost sure is a problem about DNS configuration, check your /etc/resolv.conf or resolvconf settings if you use it, if it's not a DNS problem set 'No Proxy' on Firefox network settings (the default value)

Last edited by brainfucksec (2017-04-12 17:29:58)

rafdre · 2017-04-12 17:52:28

thanks for first reply ;-)
the strange thing is that one day after I created this post it worked fine and now is again not working.
I will also try to install Opera and check if there it will work (I want to exclude wrong settings in Firefox or bug in Firefox).
Actually apart of the full system upgrade the only software I installed was downloaded from AUR and it was NOIP (noip-2.1.9-7-i686.pkg.tar.xz). I am using it to update my dynamic IP.
Apart of it I have played a little bit with UFW since I wanted to add some rules to my server to allow SSH and VNV from another local computer.

the only thing I see in /etc/resolv.conf is this:

# Generated by resolvconf
nameserver 192.168.1.1

192.168.1.1 is IP of my local router.
Via this router I connect to the internet and I do not see any issues on other PC's.

In Firefox I have "Use system proxy settings". Now I will change it and test.

rafdre · 2017-04-12 17:55:15

with "No proxy" same issue. No difference.

When I try in Opera the error says something about DNS issue.
The question is where I can check it?

Last edited by rafdre (2017-04-12 18:06:43)

rafdre · 2017-04-12 18:37:34

what I did is this:

I have disabled NOIP program like this:

systemctl disable noip2

I have restarted PC and now it works ?!
Entries in /etc/resolv.conf are same as before.

But as I said before - one day it also worked though I have not changed anything.
I will obesrve system behaviour and if it works fine I will post update here.

I do not know why NOIP should influence connection to some pages (it didn't worked only for some), but maybe some people who know more can explain it. Maybe the fact that it works now is simply random.

rafdre · 2017-04-15 09:34:14

I can confirm that after I disabled noip2 service I have not seen the error again.
I mark this thread as solved

Arch Linux

#1 2017-04-10 17:25:15

[SOLVED] Firefox - Server Not Found

#2 2017-04-10 17:28:38

Re: [SOLVED] Firefox - Server Not Found

#3 2017-04-10 20:03:54

Re: [SOLVED] Firefox - Server Not Found

#4 2017-04-12 17:26:16

Re: [SOLVED] Firefox - Server Not Found

#5 2017-04-12 17:52:28

Re: [SOLVED] Firefox - Server Not Found

#6 2017-04-12 17:55:15

Re: [SOLVED] Firefox - Server Not Found

#7 2017-04-12 18:37:34

Re: [SOLVED] Firefox - Server Not Found

#8 2017-04-15 09:34:14

Re: [SOLVED] Firefox - Server Not Found

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