subscription-manager register got Tunnel connection failed: 403 Forbidden error

My server installed RHEL 7.5 and Satellite 6.3, just bypass the authentication server IP in proxy, but when I perform subscription-manager register , it still keeps showing "Tunnel connection failed: 403 Forbidden error" in /var/log/rhsm/rhsm.log, logged case to redhat , but cannot resolve the problem

2018-07-30 18:04:27,668 [DEBUG] subscription-manager:5781:MainThread @connection.py:543 - Making request: GET /subscription/status/
2018-07-30 18:04:27,677 [ERROR] subscription-manager:5781:MainThread @utils.py:158 - Tunnel connection failed: 403 Forbidden
Traceback (most recent call last):
File "/usr/lib64/python2.7/site-packages/subscription_manager/utils.py", line 141, in is_valid_server_info
conn.ping()
File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 929, in ping
return self.conn.request_get("/status/")
File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 690, in request_get
return self._request("GET", method, headers=headers)
File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 716, in _request
info=info, headers=headers)
File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 555, in _request
conn.request(request_type, handler, body=body, headers=final_headers)
File "/usr/lib64/python2.7/httplib.py", line 1041, in request
self._send_request(method, url, body, headers)
File "/usr/lib64/python2.7/httplib.py", line 1075, in _send_request
self.endheaders(body)
File "/usr/lib64/python2.7/httplib.py", line 1037, in endheaders
self._send_output(message_body)
File "/usr/lib64/python2.7/httplib.py", line 881, in _send_output
self.send(msg)
File "/usr/lib64/python2.7/httplib.py", line 843, in send
self.connect()
File "/usr/lib64/python2.7/httplib.py", line 1251, in connect
HTTPConnection.connect(self)
File "/usr/lib64/python2.7/httplib.py", line 827, in connect
self._tunnel()
File "/usr/lib64/python2.7/httplib.py", line 809, in _tunnel
message.strip()))
error: Tunnel connection failed: 403 Forbidden