【已解答】nginx Let's Encrypt下载证书失败

系统:CentOS 8.2.2004(Py3.7.8)　　版本 7.5.22环境使用frp映射80端口到内网服务器

报错原文
msg: "During handling of the above exception, another exception occurred:↵↵Traceback (most recent call last):↵  File "class/acme_v2.py", line 1234, in apply_cert↵    cert = self.download_cert(index)↵  File "class/acme_v2.py", line 653, in download_cert↵    raise Exception("下载证书失败: {}".format(res.json()))↵Exception: 下载证书失败: curl: (28) Operation timed out after 30000 milliseconds with 0 out of 0 bytes received↵↵↵"

您好，提示连接超时，没有获取到数据。应该是CA服务机构那边无法访问到你服务器IP上。
如是内网穿透出来的话，建议您可直接去域名商申请证书。