Hi Vedsar, Try disabling IPv6 if not using it, it appears that you're trying to acess the repo by its IPv6 address. Tnx, Marius On Sat, Jan 24, 2015 at 10:44 PM, Vedsar Kushwaha <vedsarkushwaha(a)gmail.com&gt; wrote:

Thank you for quick response. after disabling IPV6, error is still there. I disabled IPV6 by vi /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 The complete error is: Adding post install manifest entries [ DONE ] Installing Dependencies [ ERROR ] ERROR : Failed to run remote script, stdout: Loaded plugins: fastestmirror, langpacks, priorities Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&i... error was 14: curl#7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable" stderr: Warning: Permanently added '10.0.2.15' (ECDSA) to the list of known hosts. + trap t ERR + yum install -y puppet hiera openssh-clients tar nc rubygem-json One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable <repoid> 4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true Cannot find a valid baseurl for repo: base/7/x86_64 ++ t ++ exit 1 I'm behind a proxy as well. But when I execute yum install -y puppet hiera openssh-clients tar nc rubygem-json, it completes successfully. when I do, wget http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&i... it download a html page index.html?release=7.2, that contains Test mode - must specify ip/cc, arch and repo as parameters On Sun, Jan 25, 2015 at 4:43 PM, Patrick Laimbock <patrick(a)laimbock.com&gt; wrote: -- Vedsar Kushwaha M.Tech-Computational Science Indian Institute of Science