申请 Let's Encrypt 证书一直失败

以前一下子就可以申请好的。今天一直是失败

证书获取失败，返回如下错误信息：

---

Bootstrapping dependencies for RedHat-based OSes... (you can skip this with --no-bootstrap)
yum is /usr/bin/yum
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.tongji.edu.cn
* extras: mirrors.aliyun.com
* updates: ftp.sjtu.edu.cn
Package gcc-4.8.5-16.el7_4.1.x86_64 already installed and latest version
Package augeas-libs-1.4.0-2.el7_4.2.x86_64 already installed and latest version
Package 1penssl-1.0.2k-8.el7.x86_64 already installed and latest version
Package 1penssl-devel-1.0.2k-8.el7.x86_64 already installed and latest version
Package libffi-devel-3.0.13-18.el7.x86_64 already installed and latest version
Package redhat-rpm-config-9.1.0-76.el7.centos.noarch already installed and latest version
Package ca-certificates-2017.2.14-71.el7.noarch already installed and latest version
Package python-2.7.5-58.el7.x86_64 already installed and latest version
Package python-devel-2.7.5-58.el7.x86_64 already installed and latest version
Package python-virtualenv-1.10.1-4.el7.noarch already installed and latest version
Package python-tools-2.7.5-58.el7.x86_64 already installed and latest version
Package python2-pip-8.1.2-5.el7.noarch already installed and latest version
Nothing to do
Creating virtual environment...
Installing Python packages...
Had a problem while installing Python packages.

此处省略  否则无法发帖

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参考此帖
https://www.bt.cn/bbs/forum.php? ... tid=9256&extra=