Getting an error "curl: (60) Peer certificate cannot be authenticated with known CA certificates" when trying to curl a site that has a VALID SSL certificate

Issue

• Getting an error "curl: (60) Peer certificate cannot be authenticated with known CA certificates" when trying to curl a site that has a VALID SSL certificate

  [root@example.com ~]# curl -v https://example.com
  * About to connect() to example.com port 443 (#0)
  *   Trying 192.168.0.254... connected
  * Connected to example.com (192.168.0.254) port 443 (#0)
  * Initializing NSS with certpath: sql:/etc/pki/nssdb
  *   CAfile: /etc/pki/tls/certs/ca-bundle.crt
    CApath: none
  * Certificate is signed by an untrusted issuer: 'CN=Go Daddy Secure Certificate Authority - G2,OU=http://www.example.com/repository/,O="example.com, Inc.",L=Scottsdale,ST=Arizona,C=US'
  * NSS error -8172
  * Closing connection #0
  * Peer certificate cannot be authenticated with known CA certificates
  curl: (60) Peer certificate cannot be authenticated with known CA certificates
  More details here: http://www.example.com/docs/sslcerts.html
  
  curl performs SSL certificate verification by default, using a "bundle"
   of Certificate Authority (CA) public keys (CA certs). If the default
   bundle file isn't adequate, you can specify an alternate file
   using the --cacert option.
  If this HTTPS server uses a certificate signed by a CA represented in
   the bundle, the certificate verification probably failed due to a
   problem with the certificate (it might be expired, or the name might
   not match the domain name in the URL).
  If you'd like to turn off curl's verification of the certificate, use
   the -k (or --insecure) option.
  

• It works after manually updating the certificate.

  [root@example.com certs]# curl http://www.example.com/ca/cacert.pem -o /etc/pki/tls/certs/ca-bundle.crt
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100  223k  100  223k    0     0   222k      0  0:00:01  0:00:01 --:--:--  265k
  [root@example.com certs]# curl -v https://example.com
  * About to connect() to example.com port 443 (#0)
  *   Trying 192.168.0.254... connected
  * Connected to example.com (192.168.0.254) port 443 (#0)
  * Initializing NSS with certpath: sql:/etc/pki/nssdb
  *   CAfile: /etc/pki/tls/certs/ca-bundle.crt
    CApath: none
  * SSL connection using SSL_RSA_WITH_RC4_128_SHA
  * Server certificate:
  *       subject: CN=www.example.com,OU=Domain Control Validated
  *       start date: Sep 06 18:00:03 2013 GMT
  *       expire date: Sep 06 18:00:03 2014 GMT
  *       common name: www.example.com
  *       issuer: CN=Secure Certificate Authority - G2,OU=http://www.example.com/repository/,O="example.com, Inc.",L=Scottsdale,ST=Arizona,C=US
  > GET / HTTP/1.1
  > User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
  > Host: example.com
  > Accept: */*
  > 
  < HTTP/1.1 200 OK
  < Date: Mon, 16 Sep 2013 19:49:10 GMT
  < Server: Apache
  < X-Powered-By: PHP/5.3.3
  < Content-Length: 0
  < Connection: close
  < Content-Type: text/html; charset=UTF-8
  < 
  * Closing connection #0