> No valid signing SSL certificate configured for HTTPS_port [::]:443

No valid signing SSL certificate configured for HTTPS_port [::]:443

Centos7使用#systemctl start squid 报下面的错误,但是使用 #/usr/sbin/squid -f /etc/squid/squid.conf 手动启动就成功说明squid.conf 没问题,很奇怪。