I have tried to setup odoo saas tool in my local pc. I have created two database localhost as main database and s1.localhost as server database. Configuration and app setup are done according to official documentation

https://odoo-saas-tools.readthedocs.io/en/11.0/setup/install.html

I have configured the Authentication URL as 
http://localhost/oauth2/auth
and Validation URL as
 http://localhost/oauth2/tokeninfo

and setup the base domain as

http://localhost

When I have tried to sync register server and create template DB I have got the following error 

requests.exceptions.ConnectionError: HTTPConnectionPool(host='s1.localhost', port=8069): Max retries exceeded with url: /saas_server/sync_server (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f4fa17d9198>: Failed to establish a new connection: [Errno -2] Name or service not known',))

I can't create the template Database. How to solve this error? Here the full error:

Traceback (most recent call last):
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connection.py", line 142, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/util/connection.py", line 75, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "/usr/lib/python3.5/socket.py", line 732, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 595, in urlopen
    chunked=chunked)
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 363, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.5/http/client.py", line 1106, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib/python3.5/http/client.py", line 1151, in _send_request
    self.endheaders(body)
  File "/usr/lib/python3.5/http/client.py", line 1102, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python3.5/http/client.py", line 934, in _send_output
    self.send(msg)
  File "/usr/lib/python3.5/http/client.py", line 877, in send
    self.connect()
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connection.py", line 167, in connect
    conn = self._new_conn()
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connection.py", line 151, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.HTTPConnection object at 0x7f4fa17d9198>: Failed to establish a new connection: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 640, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/packages/urllib3/util/retry.py", line 287, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
requests.packages.urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='s1.localhost', port=8069): Max retries exceeded with url: /saas_server/sync_server (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f4fa17d9198>: Failed to establish a new connection: [Errno -2] Name or service not known',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/odoo11/intelio1/odoo/http.py", line 650, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/opt/odoo11/intelio1/odoo/http.py", line 310, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/opt/odoo11/intelio1/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/opt/odoo11/intelio1/odoo/http.py", line 692, in dispatch
    result = self._call_function(**self.params)
  File "/opt/odoo11/intelio1/odoo/http.py", line 342, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/odoo11/intelio1/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/odoo11/intelio1/odoo/http.py", line 335, in checked_call
    result = self.endpoint(*a, **kw)
  File "/opt/odoo11/intelio1/odoo/http.py", line 936, in __call__
    return self.method(*args, **kw)
  File "/opt/odoo11/intelio1/odoo/http.py", line 515, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo11/intelio1/addons/web/controllers/main.py", line 938, in call_button
    action = self._call_kw(model, method, args, {})
  File "/opt/odoo11/intelio1/addons/web/controllers/main.py", line 926, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/opt/odoo11/intelio1/odoo/api.py", line 689, in call_kw
    return call_kw_multi(method, model, args, kwargs)
  File "/opt/odoo11/intelio1/odoo/api.py", line 680, in call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/opt/odoo11/intelio1/saas_addons/saas_portal/models/saas_portal.py", line 147, in action_sync_server
    res = requests.Session().send(req, **req_kwargs)
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/sessions.py", line 596, in send
    r = adapter.send(request, **kwargs)
  File "/opt/odoo11/intelio1/env/lib/python3.5/site-packages/requests/adapters.py", line 487, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='s1.localhost', port=8069): Max retries exceeded with url: /saas_server/sync_server (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f4fa17d9198>: Failed to establish a new connection: [Errno -2] Name or service not known',))