Nginx 14.1 very slow as a reverse proxy

Ricky Gutierrez xserverlinux at
Tue Nov 20 01:37:34 UTC 2018

Hi list , I need a little help, I have a reverse proxy in front of an application, the nginx server has it with 4gb ram, disk sas at
15K and 2 core in centos 7, I've noticed that the proxy acts very
slow, checking the log I see a lot

2018/11/19 14:10:04 [error] 16379#16379: *51 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client:, server:, request: "POST
/Usuario/Login HTTP/1.1", upstream:
"http://192.168.X.11:80/Usuario/Login", host: "",
referrer: ""

if I remove the proxy and leave only the application is fast and
without delay, I put the proxy and I have a lot of delay.
I have around 40 concurrent connections, my internal network between
the proxy and the IIS server is 1gb network, very fast ,

my config :

upstream backend {

    server 192.168.X.11:80; ## servidor web en windows
    keepalive 15;


location / {

        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_connect_timeout 600;
        proxy_send_timeout 600;
        proxy_read_timeout 600;
        send_timeout 600;
        proxy_buffers           32 4m;
        proxy_busy_buffers_size     25m;
        proxy_buffer_size 512k;
        proxy_max_temp_file_size 0;
        client_max_body_size        1024m;
        client_body_buffer_size     4m;
        proxy_intercept_errors off;
        proxy_pass http://backend;



I hope a light in this darkness;)



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