在服务器上配置好了nginx，但过几天，在访问主机，地址浏览器就一直加载。请大神指教。
#Nginx所用用户和组
#user niumd niumd;
#工作的子进程数量（通常等于CPU数量或者2倍于CPU）
worker_processes 2;
#错误日志存放路径
#error_log logs/error.log;
#error_log logs/error.log notice;
error_log logs/error.log info;
#指定pid存放文件
pid logs/nginx.pid;
events {
#使用网络IO模型linux建议epoll，FreeBSD建议采用kqueue
#use epoll;
#允许最大连接数
worker_connections 2048;
}
http {
include mime.types;
default_type application/octet-stream;
#定义日志格式
#log_format main '$remote_addr - $remote_user [$time_local] $request '
# '"$status" $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log off;
access_log logs/access.log;
client_header_timeout 60m;
client_body_timeout 60m;
send_timeout 60m;
client_header_buffer_size 1k;
large_client_header_buffers 4 4k;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
#keepalive_timeout 75 20;
include gzip.conf;
upstream tomcat {
#ip_hash weight=2
server 223.87.85.165:8085 weight=2;
server 223.87.85.166:8081 weight=2;
server 223.87.85.167:8081 weight=2;
ip_hash;
}
server {
listen 80;
server_name localhost;
location / {
proxy_connect_timeout 60;
proxy_send_timeout 60;
proxy_read_timeout 60;
proxy_pass http://tomcat;
}
}
}