解决fatal: unable to access 'https://github.com/brocaar/chirpstack-docker.git/': Failed connect to github.com:443; Connection refused

解决方法（2步 ）

输入git config --global --unset http.proxy
输入git config --global --unset https.proxy

[root@localhost ~]# git clone https://github.com/brocaar/chirpstack-docker.git
正克隆到 'chirpstack-docker'...
remote: Enumerating objects: 271, done.
remote: Counting objects: 100% (98/98), done.
remote: Compressing objects: 100% (36/36), done.
remote: Total 271 (delta 77), reused 68 (delta 62), pack-reused 173
接收对象中: 100% (271/271), 54.88 KiB | 0 bytes/s, done.
处理 delta 中: 100% (141/141), done.