Description of problem:
Client can't list what os release to use when run "subscription-manager release --list" and report "Network error, unable to connect to server".

Version-Release number of selected component (if applicable):
katello-configure-0.3.3-2.el6_2.noarch
katello-headpin-all-0.2.6-4.el6_2.noarch
katello-common-0.3.1-1.el6_2.noarch
katello-cli-common-0.3.2-3.el6_2.noarch
katello-headpin-0.2.6-4.el6_2.noarch
katello-glue-candlepin-0.3.1-1.el6_2.noarch
katello-cli-headpin-0.2.0-1.el6_2.noarch
katello-selinux-0.2.4-1.el6_2.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
katello-certs-tools-1.1.5-1.el6_2.noarch
candlepin-0.6.2-1.el6_2.noarch
katello-glue-candlepin-0.3.1-1.el6_2.noarch
candlepin-tomcat6-0.6.2-1.el6_2.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
thumbslug-0.0.24-1.el6_2.noarch

How reproducible:
100%

Steps to Reproduce:
1.Register to sam (SAM-2012-05-15.1)
#subscription-manager register 
Username: admin
Password: 
The system has been registered with id: eb11c01e-a6a6-477f-a091-862e334f1446 
2.Subscribe subscription
# subscription-manager subscribe --auto
Installed Product Current Status:
Product Name:         	Red Hat Enterprise Linux Server
Status:               	Subscribed               
3.List what os release to use
# subscription-manager release --list
Network error, unable to connect to server.
Please see /var/log/rhsm/rhsm.log for more information.
  
Actual results:
# subscription-manager release --list
Network error, unable to connect to server.
Please see /var/log/rhsm/rhsm.log for more information.

Expected results:
Can't list what os release to use as following:
#subscription-manager release --list
6.1
6.2
6.3
6Client
6Server
6ComputeNode
6Workstation

Additional info:
#cat /var/log/rhsm/rhsm.log
........
2012-05-16 16:09:02,697 [ERROR]  @managercli.py:101 - exception caught in subscription-manager
2012-05-16 16:09:02,698 [ERROR]  @managercli.py:102 - [Errno -2] Name or service not known
Traceback (most recent call last):
  File "/usr/sbin/subscription-manager", line 79, in <module>
    sys.exit(abs(main() or 0))
  File "/usr/sbin/subscription-manager", line 70, in main
    return managercli.CLI().main()
  File "/usr/share/rhsm/subscription_manager/managercli.py", line 1774, in main
    return cmd.main()
  File "/usr/share/rhsm/subscription_manager/managercli.py", line 277, in main
    return_code = self._do_command()
  File "/usr/share/rhsm/subscription_manager/managercli.py", line 1045, in _do_command
    releases = self.release_backend.get_releases()
  File "/usr/share/rhsm/subscription_manager/release.py", line 94, in get_releases
    data = self.content_connection.get_versions(listing_path)
  File "/usr/lib/python2.6/site-packages/rhsm/connection.py", line 215, in get_versions
    results = self._request("GET", handler, body="")
  File "/usr/lib/python2.6/site-packages/rhsm/connection.py", line 183, in _request
    conn.request("GET", handler, body="", headers={"Content-Length": "0"})
  File "/usr/lib64/python2.6/httplib.py", line 914, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.6/httplib.py", line 951, in _send_request
    self.endheaders()
  File "/usr/lib64/python2.6/httplib.py", line 908, in endheaders
    self._send_output()
  File "/usr/lib64/python2.6/httplib.py", line 780, in _send_output
    self.send(msg)
  File "/usr/lib64/python2.6/httplib.py", line 739, in send
    self.connect()
  File "/usr/lib64/python2.6/site-packages/M2Crypto/httpslib.py", line 51, in connect
    socket.getaddrinfo(self.host, self.port, 0, socket.SOCK_STREAM):
gaierror: [Errno -2] Name or service not known