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I am using CentOS 6.4 in a corporate lab, and the yum update fails with the below error:

I am able to access the same repositories through the browser.

[root@LAB1 ~]# yum update
Loaded plugins: refresh-packagekit, security
base                                                     | 3.7 kB     00:00 [Errno 12] Timeout on (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.  
Error: failure: repodata/1e584feac3f3fb76ad4b6fb7e1bc8d44fa124814e9d186dc913ded3c63a216b3-primary.sqlite.bz2 from base: [Errno 256] No more mirrors to try.

Below is what I have in /etc/yum.repos.d/CentOS-Base.repo

name=CentOS-$releasever - Base

#released updates
name=CentOS-$releasever - Updates

Here is what I have in /etc/resolv.conf

# Generated by NetworkManager

yum.conf file:


I am able to ping the above nameserver. And I have tried the yum update after running yum clean all but with the same result.

I am able to wget/curl the same link and it connects and downloads. I also tried yum update right after, which again failed with the same error. Here is the output:

[root@LAB1 ~]# wget
--2013-11-15 21:29:45--
Connecting to||:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4578998 (4.4M) [application/x-bzip2]
Saving to: “1e584feac3f3fb76ad4b6fb7e1bc8d44fa124814e9d186dc913ded3c63a216b3-primary.sqlite.bz2”

100%[======================================>] 4,578,998   5.52M/s   in 0.8s    

2013-11-15 21:30:50 (5.52 MB/s) - “1e584feac3f3fb76ad4b6fb7e1bc8d44fa124814e9d186dc913ded3c63a216b3-primary.sqlite.bz2” saved [4578998/4578998]

FINISHED --2013-11-15 21:30:50--
Downloaded: 1 files, 4.4M in 0.8s (5.52 MB/s)

[root@LAB1 ~]# curl -O  
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 4471k  100 4471k    0     0  67874      0  0:01:07  0:01:07 --:--:-- 1071k

Sometimes I am also getting the below error on some of the mirrors: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host ''"
Trying other mirror.

As I am new to Linux and networking, any help here is much appreciated.

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What happens if you try to use wget or curl on that URL in the message? Those errors sound like networking issues. Either blocked hosts/ports or severely limited connectivity throughput. – Etan Reisner Nov 15 '13 at 15:58
CentOS 6 installs with the network connection in manual mode. Use ifconfig to see what interfaces are up. Use ifup eth0 to bring up that interface. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 and change onboot to yes to have it brought up when the system boots. – Brian Nov 15 '13 at 16:03
@EtanReisner : I have included the results of wget to my question – Siva Nov 15 '13 at 16:10
You appear to be having at least some networking problems though I can't say why that would affect yum worse than wget and curl. A dump of the network traffic while yum is running might tell you something useful. You might also want to try manually finding a mirror that can work for you. – Etan Reisner Nov 15 '13 at 16:57
@rickhg12hs : the issue got resolved by overriding the timeout parameter. Thanks for your help. – Siva Nov 19 '13 at 17:03

2 Answers 2

up vote 3 down vote accepted

I could finally resolve this issue by adding timeout=300 to the /etc/yum.conf file. Thanks to all who tried to help.

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I know why you had this problem and it's the same issue I have. The corporate proxy has to download the HTTP request in its entirety before you can download it on Fedora. So the proxy is sending these keep-alives so the connection stays open (stalling while it downloads and performs any security scans). This feature is annoying if you didn't ask for it. It appears to Yum that you have a crappy download speed, but once the proxy is ready you will download at full blast. – pokstad Feb 7 '14 at 0:40

Requirements: libpcap: module provides a user-level network packet capture information and statistics. libncurses: is a API programming library that enables programmers to provide text-based interfaces in a terminal. gcc: GNU Compiler Collection (GCC) is a compiler system produced by the GNU Project supporting various programming languages.

Install libpcap, libnurses, gcc via yum

yum -y install libpcap libpcap-devel ncurses ncurses-devel gcc

Download and Install iftop

make install
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