Unable to download webpage: <urlopen error [Errno 60] Operation timed out>

[amio]

Downloads » youtube-dl -f bestaudio WBVnF0sr8Xc --verbose
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-f', 'bestaudio', 'WBVnF0sr8Xc', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.12.01
[debug] Python version 2.7.6 - Darwin-14.0.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.4.4, ffprobe 2.4.4
[debug] Proxy map: {}
[youtube] WBVnF0sr8Xc: Downloading webpage
ERROR: Unable to download webpage: <urlopen error [Errno 60] Operation timed out> (caused by URLError(error(60, 'Operation timed out'),))
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 274, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1321, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 404, in open
    response = self._open(req, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 422, in _open
    '_open', req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 410, in https_open
    return self.do_open(HTTPSConnectionV3, req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1184, in do_open
    raise URLError(err)

Seems like a same problem as #3785

[amio]

I figure out what happened, It was block by my ISP.
Adding a --proxy xxxwill fix it.

[pastriver]

there is a message that "urllib2.URLError: <urlopen error [Errno 60] Operation timed out>",can you help to figure out what is the problem