Description of problem:
I see "Network error, unable to connect to server." when attaching pool quite frequently.


Version-Release number of selected component (if applicable):
python-rhsm-1.9.6-1.el6.x86_64
subscription-manager-1.9.11-1.el6.x86_64


How reproducible:
Hard to reproduce


Steps to Reproduce:
1. # set -x; while true; do date; subscription-manager register --force --username <user> --password <pass> && subscription-manager attach --pool <poolID> && subscription-manager unregister || break; done


Actual results:
When I have tried, I got it for ~3rd loop:

+ true
+ date
Tue Jun  3 17:00:26 CEST 2014
+ subscription-manager register --force --username <user> --password <pass>
The system has been registered with ID: <sysID> 
+ subscription-manager attach --pool <poolID>
Successfully attached a subscription for: Red Hat Employee Subscription
Network error, unable to connect to server.
Please see /var/log/rhsm/rhsm.log for more information.
+ break

Traceback is:

2014-06-03 17:01:25,670 [DEBUG]  @connection.py:441 - Making request: GET /subscription/consumers/<sysID>/certificates/serials
2014-06-03 17:02:26,598 [ERROR]  @certlib.py:236 - 
Traceback (most recent call last):
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 234, in perform
    expected = self._get_expected_serials(report)
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 315, in _get_expected_serials
    exp = self.get_certificate_serials_list()
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 308, in get_certificate_serials_list
    reply = self.uep.getCertificateSerials(self._get_consumer_id())
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 877, in getCertificateSerials
    return self.conn.request_get(method)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 541, in request_get
    return self._request("GET", method)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 455, in _request
    response = conn.getresponse()
  File "/usr/lib64/python2.6/httplib.py", line 990, in getresponse
    response.begin()
  File "/usr/lib64/python2.6/httplib.py", line 391, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python2.6/httplib.py", line 349, in _read_status
    line = self.fp.readline()
  File "/usr/lib64/python2.6/socket.py", line 433, in readline
    data = recv(1)
  File "/usr/lib64/python2.6/site-packages/M2Crypto/SSL/Connection.py", line 228, in read
    return self._read_bio(size)
  File "/usr/lib64/python2.6/site-packages/M2Crypto/SSL/Connection.py", line 213, in _read_bio
    return m2.ssl_read(self.ssl, size, self._timeout)
SSLTimeoutError
2014-06-03 17:02:26,603 [ERROR]  @certlib.py:237 - Cannot modify subscriptions while disconnected
2014-06-03 17:02:26,604 [ERROR]  @managercli.py:151 - Unable to attach: 
2014-06-03 17:02:26,605 [ERROR]  @managercli.py:152 - 
Traceback (most recent call last):
  File "/usr/share/rhsm/subscription_manager/managercli.py", line 1456, in _do_command
    result = self.certlib.update()
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 68, in update
    return self._do_update()
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 91, in _do_update
    return action.perform(lock=self.lock)
  File "/usr/share/rhsm/subscription_manager/certlib.py", line 238, in perform
    raise Disconnected()
Disconnected


Expected results:
No error should happen.


Additional info:
Please let me know if this is more problem of hosted services than client tools. Anyway if it is this frequent, maybe the client tool could use some retry mechanism?