首先,打开
The Best IP Address, Email and Networking Tools www.ipaddress.com/ 查询以下三个链接的DNS解析地址
github.com assets-cdn.github.com github.global.ssl.fastly.net
140.82.113.4 185.199.108.153 151.101.1.194
接着,打开系统hosts文件(需管理员权限)。 路径：C:\Windows\System32\drivers\etc
mac或者其他linux系统的话,是/etc下的hosts文件,需要切入到root用户修改
# 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
140.82.113.3 github.com
185.199.108.153 assets-cdn.github.com
199.232.69.194 github.global.ssl.fastly.net
并在末尾添加三行记录并保存。(需管理员权限，注意IP地址与域名间需留有空格) 感谢评论区 @trans-bug 的分享， 对于ubuntu系统，修改完hosts文件执行如下命令: sudo /etc/init.d/network-manager restart 3. 刷新系统DNS缓存
最后,Windows+X 打开系统命令行（管理员身份）或powershell
运行 ipconfig /flushdns 手动刷新系统DNS缓存。