git clone 出现fatal: unable to access ‘https://github.com/xxx: Failed to connect to github.com

Problem description:
When using the git clone command, the following error occurs:
fatal: unable to access 'https://github.com/xxx': Failed to connect to github.com port 443: Timed out

Solution:
Change "https" to "git", such as: 'git://github.com/xxx'