fail to create a connection with nessus server

I am trying to get a connection with the Nessus server with the bellow command in python but it failed with an error message can you tell me what can be the cause. I have checked my network connection it is fine.

requests.post( 'https://164.99.175.30:8834/'+ '/session',data={'username':'admin','password':'micro@123'},verify=False)```


error message 

Traceback (most recent call last):
  File "nessus.py", line 425, in <module>
    login()
  File "nessus.py", line 111, in login
    res = requests.post(url + '/session',data={'username':username,'password':password},verify=verify)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 119, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='localhost', port=8834): Max retries exceeded with url: /session (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f46f2d6d410>: Failed to establish a new connection: [Errno 111] Connection refused',))

Solution

The nessus api is depreciated as of version 7.x, this is the best source I could find.

EDIT: I have found a better source directly from tenable

What has been removed from Nessus 7: There is a restriction in scan API capabilities. The ability to manage scans via API and CLI has been removed in v7. All Nessus Pro scanning operations must be done through the user interface. So currently the ability of the Nessus API is as follows:

Removed the ability to run scans or reports and create new objects The Read features, where the ability to pull scan data so GET /scan/scan ID now works again and this aids with some of the integration processes.

https://community.tenable.com/s/article/The-differences-between-Nessus-6-and-Nessus-7

This is only for Nessus pro versions