The error is due to corrupt or missing SSL chain certificate files in the PKI directory. You’ll need to make sure the files /etc/pki/tls/certs/ca-bundle.crt and /etc/pki/tls/certs/ca-bundle.trust.crt (on CentOS) exist on yourserver. If they do not exist, get your server management provider to complete the following steps:
- 1. mkdir /usr/src/ca-certificates && cd /usr/src/ca-certificates
- 2. wget http://mirror.centos.org/centos/6/os/i386/Packages/ca-certificates-2015.2.6-65.0.1.el6_7.noarch.rpm
- 3. rpm2cpio ca-certificates-2015.2.6-65.0.1.el6_7.noarch.rpm | cpio -idmv
- 4. cp -pi ./etc/pki/tls/certs/ca-bundle.* /etc/pki/tls/certs/