调用服务器时出现Nginx错误＃6139：* 11778767 connect（）失败（111：连接被拒绝），同时连接到上游，

Question

这是我对nginx服务器的设置

 location /v1/submit{
           # First attempt to serve request as file, then
           # as directory, then fall back to displaying a 404.
           #try_files $uri $uri/ =404;
           proxy_ssl_server_name on;
           proxy_pass  http://202.3.208.203:55000/cp/submitSM.jsp;
           proxy_connect_timeout 159s;
           proxy_send_timeout   600;
           proxy_read_timeout   600;
           proxy_buffer_size    64k;
           proxy_buffers     16 32k;   
           }

从nginx调用API时，我收到错误

  

[错误] 6139＃6139：* 11778767 connect（）失败（111：连接   连接到上游时，客户端：52.221.202.103，服务器：   _，请求：＆＃34; POST / v1 / submit