Failed to register a host to snap21 by username and password, but can be register by activation key.

# subscription-manager  register
Registering to: bootp-73-131-133.rhts.eng.pek2.redhat.com:443/rhsm
Username: admin
Password:
Remote server error. Please check the connection details, or see /var/log/rhsm/rhsm.log for more information.


# tail -f /var/log/rhsm/rhsm.log
2017-10-23 04:57:26,587 [INFO] subscription-manager:8215:MainThread @managercli.py:407 - Client Versions: {'python-rhsm': '1.19.9-1.el7', 'subscription-manager': '1.19.21-1.el7'}
2017-10-23 04:57:26,588 [INFO] subscription-manager:8215:MainThread @connection.py:822 - Connection built: host=bootp-73-131-133.rhts.eng.pek2.redhat.com port=443 handler=/rhsm auth=identity_cert ca_dir=/etc/rhsm/ca/ insecure=False
2017-10-23 04:57:26,588 [INFO] subscription-manager:8215:MainThread @connection.py:822 - Connection built: host=bootp-73-131-133.rhts.eng.pek2.redhat.com port=443 handler=/rhsm auth=none
2017-10-23 04:57:26,589 [INFO] subscription-manager:8215:MainThread @managercli.py:407 - Client Versions: {'python-rhsm': '1.19.9-1.el7', 'subscription-manager': '1.19.21-1.el7'}
2017-10-23 04:57:26,589 [INFO] subscription-manager:8215:MainThread @managercli.py:382 - Consumer Identity name=None uuid=None
2017-10-23 04:57:26,590 [INFO] subscription-manager:8215:MainThread @managercli.py:382 - Consumer Identity name=None uuid=None
2017-10-23 04:57:28,548 [INFO] subscription-manager:8215:MainThread @connection.py:822 - Connection built: host=bootp-73-131-133.rhts.eng.pek2.redhat.com port=443 handler=/rhsm auth=basic username=admin
2017-10-23 04:57:28,568 [INFO] subscription-manager:8215:MainThread @dmiinfo.py:73 - Using dmidecode dump file: /dev/mem
2017-10-23 04:57:28,618 [INFO] subscription-manager:8215:MainThread @custom.py:85 - Loading custom facts from: /etc/rhsm/facts/katello.facts
2017-10-23 04:57:28,662 [INFO] subscription-manager:8215:MainThread @connection.py:552 - Response: status=200, request="GET /rhsm/users/admin/owners"
2017-10-23 04:57:28,703 [INFO] subscription-manager:8215:MainThread @connection.py:552 - Response: status=200, request="GET /rhsm/"
2017-10-23 04:57:28,747 [INFO] subscription-manager:8215:MainThread @connection.py:552 - Response: status=404, request="GET /rhsm/owners/Default_Organization/environments"
2017-10-23 04:57:28,747 [ERROR] subscription-manager:8215:MainThread @connection.py:577 - Response: 404
2017-10-23 04:57:28,747 [ERROR] subscription-manager:8215:MainThread @connection.py:578 - JSON parsing error: Expecting ':' delimiter: line 1 column 11 (char 10)
2017-10-23 04:57:28,747 [ERROR] subscription-manager:8215:MainThread @managercli.py:177 - Error during registration: Server error attempting a GET to /rhsm/owners/Default_Organization/environments returned status 404
2017-10-23 04:57:28,747 [ERROR] subscription-manager:8215:MainThread @managercli.py:178 - Server error attempting a GET to /rhsm/owners/Default_Organization/environments returned status 404
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/subscription_manager/managercli.py", line 1187, in _do_command
    self.options.environment)
  File "/usr/lib/python2.7/site-packages/subscription_manager/managercli.py", line 1297, in _get_environment_id
    env_list = cp.getEnvironmentList(owner_key)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 1324, in getEnvironmentList
    results = self.conn.request_get(method)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 646, in request_get
    return self._request("GET", method, headers=headers)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 672, in _request
    info=info, headers=headers)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 561, in _request
    self.validateResponse(result, request_type, handler)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 616, in validateResponse
    handler=handler)
RemoteServerException: Server error attempting a GET to /rhsm/owners/Default_Organization/environments returned status 404