windows或Ubuntu中请求github.com请求超时，或在下载GitHub文件出现：＜urlopen error [Errno 110] Connection timed out＞_

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1 windows中请求github.com超时

1.1 windows中ping github.com超时

C:\Users\zfxx_1>ping github.com

正在 Ping github.com [13.229.188.59] 具有 32 字节的数据:
请求超时。
请求超时。
请求超时。
请求超时。

13.229.188.59 的 Ping 统计信息:
    数据包: 已发送 = 4，已接收 = 0，丢失 = 4 (100% 丢失)，
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但是当你正常ping baidu.com是没有问题的

C:\Users\zfxx_1>ping baidu.com

正在 Ping baidu.com [39.156.69.79] 具有 32 字节的数据:
来自 39.156.69.79 的回复: 字节=32 时间=28ms TTL=48
来自 39.156.69.79 的回复: 字节=32 时间=26ms TTL=48
来自 39.156.69.79 的回复: 字节=32 时间=26ms TTL=48
来自 39.156.69.79 的回复: 字节=32 时间=26ms TTL=48

39.156.69.79 的 Ping 统计信息:
    数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
    最短 = 26ms，最长 = 28ms，平均 = 26ms

C:\Users\zfxx_1>
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ping 不通，主要原因可能是本地DNS不能够正确解析域名导致的

1.2 解决windows中ping github.com超时问题

1、打开：C:\Windows\System32\drivers\etc\hosts配置文件，然后在其末尾添加如下内容

192.30.255.112  github.com git 
185.31.16.184 github.global.ssl.fastly.net  
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注意：

如果不能够保存，需要权限，此时可以把修改后的hosts文件另存，然后再复制替换C:\Windows\System32\drivers\etc\hosts即可！

2、修改完之后，然后再重新打开一个终端，再ping github.com，即通！

C:\Users\zfxx_1>ping github.com

正在 Ping github.com [192.30.255.112] 具有 32 字节的数据:
来自 192.30.255.112 的回复: 字节=32 时间=352ms TTL=47
来自 192.30.255.112 的回复: 字节=32 时间=353ms TTL=47
来自 192.30.255.112 的回复: 字节=32 时间=353ms TTL=47
来自 192.30.255.112 的回复: 字节=32 时间=355ms TTL=47

192.30.255.112 的 Ping 统计信息:
    数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
    最短 = 352ms，最长 = 355ms，平均 = 353ms

C:\Users\zfxx_1>
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2 Ubuntu中请求github.com超时

修改和windows中类似

1、需要再root权限下修改 /etc/hosts配置文件，然后再其中添加如下两行内容：

192.30.255.112  github.com git 
185.31.16.184 github.global.ssl.fastly.net  
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2、修改完之后，然后重新打开一个终端，再ping github.com 即通！

p(base) shl@zfcv:~$ ping github.com
PING github.com (192.30.255.112) 56(84) bytes of data.
64 bytes from github.com (192.30.255.112): icmp_seq=1 ttl=47 time=386 ms
64 bytes from github.com (192.30.255.112): icmp_seq=2 ttl=47 time=372 ms
64 bytes from github.com (192.30.255.112): icmp_seq=4 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=6 ttl=47 time=376 ms
64 bytes from github.com (192.30.255.112): icmp_seq=7 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=8 ttl=47 time=372 ms
64 bytes from github.com (192.30.255.112): icmp_seq=9 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=11 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=12 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=13 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=14 ttl=47 time=371 ms
64 bytes from github.com (192.30.255.112): icmp_seq=15 ttl=47 time=372 ms
64 bytes from github.com (192.30.255.112): icmp_seq=16 ttl=47 time=372 ms
64 bytes from github.com (192.30.255.112): icmp_seq=18 ttl=47 time=376 ms
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3 我遇到这个问题的场景

我在Ubuntu18.04环境中，想要运行yolov5的，然后在下载文件的时候一直超时

>>> import torch
>>> model = torch.hub.load('ultralytics/yolov5', 'yolov5s', pretrained=True)
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运行上面的代码，会从github下载一些文件，然后就会出现超时：urllib.error.URLError: <urlopen error [Errno 110] Connection timed out>

(yolov5-v3) shl@zfcv:~/project/yolov5_hub$ python
Python 3.8.5 (default, Aug  5 2020, 08:36:46)
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> model = torch.hub.load('ultralytics/yolov5', 'yolov5s', pretrained=False)
Downloading: "https://github.com/ultralytics/yolov5/archive/master.zip" to /home/shl/.cache/torch/hub/master.zip
vi Traceback (most recent call last):
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 1350, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 1255, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 1301, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 1250, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 1010, in _send_output
    self.send(msg)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 950, in send
    self.connect()
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 1417, in connect
    super().connect()
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/http/client.py", line 921, in connect
    self.sock = self._create_connection(
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/socket.py", line 808, in create_connection
    raise err
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/socket.py", line 796, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/site-packages/torch/hub.py", line 345, in load
    repo_dir = _get_cache_or_reload(github, force_reload, verbose)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/site-packages/torch/hub.py", line 144, in _get_cache_or_reload
    download_url_to_file(url, cached_file, progress=False)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/site-packages/torch/hub.py", line 379, in download_url_to_file
    u = urlopen(req)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 542, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 1393, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
  File "/home/shl/anaconda3/envs/yolov5-v3/lib/python3.8/urllib/request.py", line 1353, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [Errno 110] Connection timed out>
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后面通过上面的方法解决了问题！！！

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