超出了Python的最大重试次数（仅在生产服务器上）

Question

我正在尝试连接到一个网页。这是我的代码：

class AddNewSite():

    def __init__(self, url, user=None, email=None, category=None, 
    subcategory=None, date_end=None):
        self.url = url
        self.user = user
        self.email = email
        req = Request(self.url, headers={'user-agent': 'Mozilla/5.0 
   (Macintosh; Intel Mac OS X 10_9_3) \
                AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 \
                Safari/537.36'})
        self.page = urlopen(req).read()
        self.soup = BeautifulSoup(self.page)
        self.meta = self.soup.find_all('meta')

在我的视图.py（这是一个Django项目）我有：

^{pr2}$

在本地主机上一切正常。它连接到站点没有eny错误。在生产服务器上，我遇到了一个异常。下面我从日志中粘贴错误。在

HTTPConnectionPool(host='exeo.pl', port=80): Max retries exceeded with url: 
/ (Caused by 
NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection 
object at 0x80897ff98>: Failed to establish a new connection: [Errno 60] 
Operation timed out',))
HTTPConnectionPool(host='exeo.pl', port=80): Max retries exceeded with url: 
/ (Caused by 
NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection 
object at 0x80940aeb8>: Failed to establish a new connection: [Errno 60] 
Operation timed out',))
HTTPConnectionPool(host='exeo.pl', port=80): Max retries exceeded with url: 
/ (Caused by 
NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection 
object at 0x80949fdd8>: Failed to establish a new connection: [Errno 60] 
Operation timed out',))
<urllib.request.Request object at 0x808b92048>

为什么问题只存在于生产服务器上？在