报错：wget命令出现Unable to establish SSL connection.

[root@localhost ~]# wget https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh 
--2021-06-22 17:43:01--  https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh
Resolving github.com (github.com)... 52.74.223.119
Connecting to github.com (github.com)|52.74.223.119|:443... connected.
Unable to establish SSL connection.

解决方法：
加上跳过验证证书的参数“–no-check-certificate”
如下图：

[root@localhost ~]# wget https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh --no-check-certificate
--2021-06-22 17:43:01--  https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh
Resolving github.com (github.com)... 52.74.223.119
Connecting to github.com (github.com)|52.74.223.119|:443... connected.
Unable to establish SSL connection.

加上参数“–no-check-certificate”后也不管用
就要想到防火墙的问题(关键)

关掉防火墙并开机不自启
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

[root@localhost ~]# wget https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh --no-check-certificate 
--2021-06-22 18:32:27--  https://github.com/jumpserver/jumpserver/releases/download/v2.1.0/quick_start.sh
Resolving github.com (github.com)... 52.74.223.119
Connecting to github.com (github.com)|52.74.223.119|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-releases.githubusercontent.com/21484781/6f563380-c79b-11ea-9162-15684126da9f?X-Amz-Algorithm=AWS4-....

即连接成功