Bug 508423 - All system and application dns queries (firefox, lynx, yum playonlinux, google talk etc) are not resolving
All system and application dns queries (firefox, lynx, yum playonlinux, googl...
Status: CLOSED DUPLICATE of bug 504951
Product: Fedora
Classification: Fedora
Component: NetworkManager (Show other bugs)
x86_64 Linux
low Severity high
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Assigned To: Dan Williams
Fedora Extras Quality Assurance
Depends On:
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Reported: 2009-06-26 20:52 EDT by dyland.desmarais
Modified: 2009-06-27 08:09 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 2009-06-27 08:09:24 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description dyland.desmarais 2009-06-26 20:52:50 EDT
User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b4) Gecko/20090427 Fedora/3.5-0.20.beta4.fc11 Firefox/3.5b4

Various apps (Yum, firefox, pidgen, playonlinux etc)  cannot seem to resolve dns searches.  For the purpose of this bug I am going to focus on yum.  I cannot reach any repository.  Returned error is as follows:

[root@enterprise dyland]# yum update
Loaded plugins: fastestmirror, presto, protectbase, refresh-packagekit
Loading mirror speeds from cached hostfile
Error: Cannot retrieve metalink for repository: fedora. Please verify its path and try again

Additional information:  
Attempting to reach download.fedoraproject.org or mirror.fedoraproject.org via lynx or firefox returns a "unable to connect to remote host" error.

Diagnostic 1:  

Both download and mirror respond to ping.

[root@enterprise yum.repos.d]# ping download.fedoraproject.org
PING wildcard.fedoraproject.org ( 56(84) bytes of data.
64 bytes from wildcard.fedoraproject.org ( icmp_seq=1 ttl=106 time=1068 ms
64 bytes from wildcard.fedoraproject.org ( icmp_seq=2 ttl=106 time=111 ms
64 bytes from wildcard.fedoraproject.org ( icmp_seq=3 ttl=106 time=111 ms
--- wildcard.fedoraproject.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2610ms
rtt min/avg/max/mdev = 111.661/430.710/1068.652/451.093 ms, pipe 2

[root@enterprise yum.repos.d]# ping mirrors.fedoraproject.org
PING wildcard.fedoraproject.org ( 56(84) bytes of data.
64 bytes from wildcard.fedoraproject.org ( icmp_seq=1 ttl=106 time=112 ms
64 bytes from wildcard.fedoraproject.org ( icmp_seq=2 ttl=106 time=113 ms

Both firefox and lynx can reach these sites via ip.  URL address still fails.  This indicates DNS issue.

Diagnostic 2: 
Confirm dns settings are correct

[root@enterprise yum.repos.d]# cat /etc/resolv.conf
# Generated by NetworkManager
domain cg.shawcable.net
search cg.shawcable.net

[root@enterprise yum.repos.d]# dig www.intel.com @

; <<>> DiG 9.6.1rc1-RedHat-9.6.1-0.4.rc1.fc11 <<>> www.intel.com @
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33668
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0

;www.intel.com.			IN	A

www.intel.com.		6195	IN	CNAME	www.intel.com.edgesuite.net.
www.intel.com.edgesuite.net. 2941 IN	CNAME	www.intel-sino.com.edgesuite.net.
www.intel-sino.com.edgesuite.net. 20941	IN CNAME www.intel-sino.com.edgesuite.net.chinaredirector.akadns.net.
www.intel-sino.com.edgesuite.net.chinaredirector.akadns.net. 2941 IN CNAME a961.g.akamai.net.
a961.g.akamai.net.	20	IN	A
a961.g.akamai.net.	20	IN	A

;; Query time: 61 msec
;; WHEN: Thu Jun 25 21:27:11 2009
;; MSG SIZE  rcvd: 231

Confirmed correct dns server addresses and they are functioning.

Diagnostic 3:  
Statically assigned ip in the hosts file and then ran yum update

[root@enterprise yum.repos.d]# cat /etc/hosts localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 download.fedoraproject.org mirrors.fedoraproject.org linuxdownload.adobe.com rpm.livna.org download1.rpmfusion.org mirrors.rpmfusion.org 

Yum updates now work

Conclusion: Something is interfering with fedora 11 functions from accessing dns in the protocol stack (my best guest).

Note: Firefox was fixed by going to about:config and changing 

network.dns.disableIPv6 = TRUE

I suspect the underlying ipv6 functions may be interfering if Firefox is any indication.

Reproducible: Always

Steps to Reproduce:
Unknown.  Install (dvd iso) and first yum update provided no problems.  System worked fine first couple of days.
Actual Results:  
n/a  A number of yum issues have appeared on the Fedora Forum which have been resolved with the instructions found here:


I believe this fix is a workaround for the bug I'm reporting

Expected Results:  
all software should resolve ip addresses via dns.

[root@enterprise ~]# uname -a
Linux enterprise #1 SMP Wed May 27 17:27:08 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
Comment 1 Niels Haase 2009-06-27 08:09:24 EDT
Thank you for the bug report. This particular bug has already been reported into our bug tracking system, but please feel free to report any further bugs you find

Fedora Bugzappers volunteer triage team

*** This bug has been marked as a duplicate of bug 504951 ***

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