问应用偶尔报504错误，504 Gateway Time-out stgw/1.3.5_1.13.5？

应用偶尔报504错误，504 Gateway Time-out stgw/1.3.5_1.13.5？按照网上设置

fastcgi_connect_timeout 60;

fastcgi_send_timeout 180;

fastcgi_read_timeout 180;

fastcgi_buffer_size 128k;

fastcgi_buffers 256 16k;

的访问还是报504 请问如何解决？