问题：

IDEA连接github.com连接超时 Invalid authentication data. connect time out

 解决方案（亲测有效）：

• 修改host文件：打开 C:\Windows\System32\drivers\etc\hosts，文件末尾添加如下内容：

#github IP地址
199.232.69.194 github.global.ssl.fastly.net
140.82.113.3 github.com
140.82.112.4 www.github.com
185.199.108.153 assets-cdn.github.com
185.199.109.153 assets-cdn.github.com
185.199.110.153 assets-cdn.github.com
185.199.111.153 assets-cdn.github.com
185.199.108.153 documentcloud.github.com
185.199.109.153 documentcloud.github.com
185.199.110.153 documentcloud.github.com
185.199.111.153 documentcloud.github.com
140.82.114.3 gist.github.com
185.199.108.153 help.github.com
185.199.109.153 help.github.com
185.199.110.153 help.github.com
185.199.111.153 help.github.com
140.82.112.9 nodeload.github.com
199.232.68.133 raw.github.com
140.82.112.18 status.github.com
140.82.113.18 training.github.com
199.232.68.133 raw.githubusercontent.com
199.232.68.133 user-images.githubusercontent.com
199.232.68.133 avatars1.githubusercontent.com
199.232.68.133 avatars2.githubusercontent.com
199.232.68.133 avatars3.githubusercontent.com
199.232.68.133 cloud.githubusercontent.com
140.82.113.6 api.github.com

• 刷新DNS：打开cmd指令输入：ipconfig /flushdns
   

• idea连接github成功！