问nginx1.6 配置ssl证书，浏览器无法访问？

server {

listen 443 ssl; # 监听端口

server_name www.xxx.club; # 域名

# ssl on;

ssl_certificate /usr/local/nginx/conf/sm2/xxx.club.pem;

ssl_certificate_key /usr/local/nginx/conf/sm2/2_xxx.club.key;

#先配置签名证书，再配置加密证书，签名加密证书私钥key为同一个！

ssl_session_timeout 5m;

ssl_protocols TLSv1.1 TLSv1.2;

ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;

ssl_prefer_server_ciphers on;