解决方案：Nginx报错Error520/521：failed (SSL: error:02001002

Stoping nginx... nginx is not running.

Starting nginx... nginx: [emerg] cannot load certificate key "/www/server/panel/vhost/cert/yun.eisc.cn/privkey.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/www/server/panel/vhost/cert/yun.eisc.cn/privkey.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

 failed

分析原因：

是宝塔面板界面颁发的证书有问题。进入宝塔面板，站点管理，

这里提示：www/server/panel/vhost/cert/yun.eisc.cn/privkey.pem

可以看出是站点：yun.eisc.cn 出现了问题

处理方法：

关闭了站点 yun.eisc.cn  的ssl 证书开关。然后Nginx 正常启动