错误来源:Centos 7 上使用nginx为Node.js配置反向代理时产生(13: Permission denied) while connecting to upstream的错误 nginx配置文件内容如下: upstream node_server { server 127.0.0.1:5000 max_fails=3 fail_timeout=4s; server 127.0.0.1:5001 max_fails=3 fail_timeout=4s; } server { list