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http://www.cnblogs.com/taiyanghua0522/p/6043942.html

原因是因为github的问题

1.打开终端(cmd),输入命令:ping 192.30.253.112 发现连接超时;输入命令:ping github.com 显示超时。

2.打开 hosts文件,地址:C:\Windows\System32\drivers\etc  看是否是默认配置。默认配置如下:

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# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host
 
# localhost name resolution is handled within DNS itself.
#   127.0.0.1       localhost
#   ::1             localhost

  如果不是,还原成默认配置。

3.

看自己的ip地址(我的是联通的):

 

4.在终端输入命令:ping github.com 如果还是超时,则打开http://ping.chinaz.com/https://github.com,搜索github的ip地址,

查询结果:

 

 

 然后在hosts文件中添加:

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192.30.253.112 github.com
151.101.88.249 github.global.ssl.fastly.net

  在终端输入 ping github.com,如果通了,就可以了

4.然后就可以正常操作了