Unable to Pull EPEL repository Metadata

Installing Nginx on Scientific Linux according this documentation fails: [vagrant@localhost ~]$ sudo su -c 'rpm -Uvh http://dl.fedoraproject.org/pub/epe l/6/x86_64/epel-release-6-8.noarch.rpm' Retrieving http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch .rpm warning: /var/tmp/rpm-tmp.gdSOR9: Header V3 RSA/SHA256 Signature, key ID 0608b89 5: NOKEY Preparing... ########################################### [100%] 1:epel-release ########################################### [100%] [vagrant@localhost ~]$ sudo yum install nginx Loaded plugins: security Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Pl ease verify its path and try again [vagrant@localhost ~]$ **Version information** [vagrant@localhost ~]$ uname -a Linux localhost.localdomain 2.6.32-431.el6.x86_64 #1 SMP Thu Nov 21 13:35:52 CST 2013 x86_64 x86_64 x86_64 GNU/Linux [vagrant@localhost ~]$ cat /etc/*{release,version} Scientific Linux release 6.5 (Carbon) Scientific Linux release 6.5 (Carbon) cat: /etc/*version: No such file or directory [vagrant@localhost ~]$ **Note:** sudo yum update -y was issued before starting the installation of nginx **Installation of other packages disabled** [vagrant@localhost ~]$ sudo yum install vim -y Loaded plugins: security Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Pl ease verify its path and try again [vagrant@localhost ~]$ **URLGRABBER Debugger Log** 2014-08-03 14:22:44,437 attempt 1/10: https://mirrors.fedoraproject.org/metalink ?repo=epel-6&arch=x86_64 INFO:urlgrabber:attempt 1/10: https://mirrors.fedoraproject.org/metalink?repo=ep el-6&arch=x86_64 2014-08-03 14:22:44,438 opening local file "/var/cache/yum/x86_64/6.5/epel/metal ink.xml.tmp" with mode wb INFO:urlgrabber:opening local file "/var/cache/yum/x86_64/6.5/epel/metalink.xml. tmp" with mode wb * About to connect() to mirrors.fedoraproject.org port 443 (#0) * Trying IP... * connected * Connected to mirrors.fedoraproject.org (IP) port 443 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * NSS error -8018 * Closing connection #0 * Problem with the SSL CA cert (path? access rights?) 2014-08-03 14:22:50,071 exception: [Errno 14] PYCURL ERROR 77 - "Problem with th e SSL CA cert (path? access rights?)" INFO:urlgrabber:exception: [Errno 14] PYCURL ERROR 77 - "Problem with the SSL CA cert (path? access rights?)" 2014-08-03 14:22:50,072 retrycode (14) not in list [-1, 2, 4, 5, 6, 7], re-raisi ng INFO:urlgrabber:retrycode (14) not in list [-1, 2, 4, 5, 6, 7], re-raising Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Pl ease verify its path and try again **Output yum update before and after attempt to install nginx** [vagrant@localhost ~]$ sudo yum update -y Loaded plugins: security Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Pl ease verify its path and try again [vagrant@localhost ~]$ **yum --disablerepo="epel" update** [vagrant@localhost ~]$ sudo yum --disablerepo="epel" update Loaded plugins: security Setting up Update Process No Packages marked for Update