Python 请求 [Errno 111] 在服务器上运行时连接被拒绝，但不在本地 PC 上运行

Question

我有一个网络抓取脚本，它在我的（Windows）PC 上运行良好，但我试图让它从（Linux）网络服务器上运行。我有许多其他脚本在服务器上运行良好（连接到与此不同的网站），但是当我运行此脚本时，出现[Errno 111] Connection refused错误。

这是演示问题的脚本的最小版本：

import time
import requests
import urllib.request
from bs4 import BeautifulSoup

s = requests.Session()

target = "http://taxsearch.co.grayson.tx.us:8443/"
headers = {"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
           "Accept-Encoding": "gzip, deflate",
           "Accept-Language": "en",
           "Cache-Control": "no-cache",
           "Connection": "keep-alive",
           "Host": "taxsearch.co.grayson.tx.us:8443",
           "Pragma": "no-cache",
           "Upgrade-Insecure-Requests": "1",
           "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36"
}


time.sleep(1)
response = s.get(target, headers=headers)

if response.status_code == requests.codes.ok:
    results = BeautifulSoup(response.text, 'html.parser')

    # Do something with output
else:
    response.raise_for_status()

这在我的 PC 上运行良好，但在服务器上运行时，出现以下错误：

Traceback (most recent call last):
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connection.py", line 159, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/util/connection.py", line 80, in create_connection
    raise err
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/util/connection.py", line 70, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 354, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/opt/alt/python36/lib64/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/opt/alt/python36/lib64/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/opt/alt/python36/lib64/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/opt/alt/python36/lib64/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/opt/alt/python36/lib64/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connection.py", line 181, in connect
    conn = self._new_conn()
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connection.py", line 168, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x2af700598c18>: Failed to establish a new connection: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 638, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/urllib3/util/retry.py", line 398, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='taxsearch.co.grayson.tx.us', port=8443): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x2af700598c18>: Failed to establish a new connection: [Errno 111] Connection refused',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "../python/grayson-2year.py", line 22, in <module>
    response = s.get(target, headers=headers)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/requests/sessions.py", line 546, in get
    return self.request('GET', url, **kwargs)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/jken/virtualenv/web-scraper/3.6/lib/python3.6/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='taxsearch.co.grayson.tx.us', port=8443): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x2af700598c18>: Failed to establish a new connection: [Errno 111] Connection refused',))

我的猜测是这里的问题归结为网络服务器上的某些防火墙问题或其他什么，但我真的不确定。有什么我想念的吗？