network command fail certificate check issue

silkaj network
Requested default node: <duniter.org:10901>
Getting informations about nodes:
0% g1.cgeek.fr 80
3% g1.duniter.org 10901
6% g1.duniter.tednet.fr 8999
9% duniter-g1.vincentux.fr 443
12% jytou.synology.me 9004
Traceback (most recent call last):
  File "/usr/lib64/python3.5/urllib/request.py", line 1254, in do_open
    h.request(req.get_method(), req.selector, req.data, headers)
  File "/usr/lib64/python3.5/http/client.py", line 1107, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python3.5/http/client.py", line 1152, in _send_request
    self.endheaders(body)
  File "/usr/lib64/python3.5/http/client.py", line 1103, in endheaders
    self._send_output(message_body)
  File "/usr/lib64/python3.5/http/client.py", line 934, in _send_output
    self.send(msg)
  File "/usr/lib64/python3.5/http/client.py", line 877, in send
    self.connect()
  File "/usr/lib64/python3.5/http/client.py", line 1261, in connect
    server_hostname=server_hostname)
  File "/usr/lib64/python3.5/ssl.py", line 385, in wrap_socket
    _context=self)
  File "/usr/lib64/python3.5/ssl.py", line 760, in __init__
    self.do_handshake()
  File "/usr/lib64/python3.5/ssl.py", line 996, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/lib64/python3.5/ssl.py", line 641, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:720)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/moul/projects/silkaj/silkaj", line 105, in <module>
    manage_cmd(ep, c)
  File "/home/moul/projects/silkaj/silkaj", line 80, in manage_cmd
    network_info(ep, c.contains_switches("discover"))
  File "/home/moul/projects/silkaj/src/commands.py", line 99, in network_info
    current_blk = get_current_block(endpoints[i])
  File "/home/moul/projects/silkaj/src/tools.py", line 42, in get_current_block
    return request(ep, "blockchain/current")
  File "/home/moul/projects/silkaj/src/network_tools.py", line 109, in request
    response = urllib.request.urlopen(request)
  File "/usr/lib64/python3.5/urllib/request.py", line 163, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python3.5/urllib/request.py", line 472, in open
    response = meth(req, response)
  File "/usr/lib64/python3.5/urllib/request.py", line 582, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python3.5/urllib/request.py", line 504, in error
    result = self._call_chain(*args)
  File "/usr/lib64/python3.5/urllib/request.py", line 444, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.5/urllib/request.py", line 696, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/usr/lib64/python3.5/urllib/request.py", line 466, in open
    response = self._open(req, data)
  File "/usr/lib64/python3.5/urllib/request.py", line 484, in _open
    '_open', req)
  File "/usr/lib64/python3.5/urllib/request.py", line 444, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.5/urllib/request.py", line 1297, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/usr/lib64/python3.5/urllib/request.py", line 1256, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:720)>