Hi , got same error while try to add hosts through cloudera manager.   Error: Cannot find a valid baseurl for repo: base Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os&infra=stock error was 14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"   -In host machine * CentOS 6.6 (Final) * firewall turn off * yum update working fine   Here we are using proxy ...  proxy settings configured with /etc/yum.conf    Regards Robin David       ... View more