Hi Just letting you know that there may be an issue with yum and https for your mirrors. I haven't tested extensively but Using CentOS 6.6 x86_64 epel-release-6-8.noarch yum repolist Loaded plugins: fastestmirror, priorities, security Determining fastest mirrors Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again wget ' https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=x86_64&am... works as expected. I am sure proxy configuration is not the issue as the test system has direct Internet access. I have confirmed that if I change the mirrorlist url to http things work as expected Thanks and let me know if I can provide an other information :)