nginx配置问题,为什么代理的tomcat一直访问不到？

nginx配置问题,为什么代理的tomcat一直访问不到？

user root root; 
worker_processes 1; 
error_log logs/error.log; 
events { 
 worker_connections 1024; 
} 
http { 
 include mime.types; 
 default_type application/octet-stream; 
 sendfile on; 
 keepalive_timeout 65; 
 #gzip on; 
 upstream yarn-master1 { 
 server 192.168.1.160:8080; 
 server 192.168.1.106:8080; 
 } 
 server { 
 listen 80; 
 server_name yarn-master1; 
 charset utf-8; 
 location / {
 root html; 
 index index.html index.htm; 
 proxy_pass http://yarn-master1; 
 proxy_set_header X-Real-IP $remote_addr; 
 client_max_body_size 100m; 
 } 
 location ~ ^/(WEB-INF)/ { deny all; } 
 error_page 500 502 503 504 /50x.html; 
 location = /50x.html { root html; } 
 } 
}