Error: Couldn't connect to server

mohan prakash mohanaprakashme at
Fri Apr 27 15:32:52 UTC 2018

Hi Liu

Client side I have increased the file descriptor value to 10000 , but still the same issue .

Also increased the FD in server side also then also same issue continuous.

Followed below link to increase the FD limit.

Linux Increase The Maximum Number Of Open Files / File Descriptors (FD) - nixCraft

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Linux Increase The Maximum Number Of Open Files / File Descriptors (FD) ...

How do I increase the maximum number of open files under CentOS Linux? How do I open more file descriptors under...



RegardsMohanaprakash T

    On Friday 27 April 2018, 7:06:51 PM IST, Liu Lantao <liulantao at> wrote:  
 It seems like your client has reach the limit of max open files. 

>From the shell where you start you client program, run ‘ulimit -a’ to check the settings.
You can also check the files open by your client in /proc/<pid>/fd/.

Increase that value is simple, you can change is temporarily or save to config file,
there are tons of documents online about how to change it.
On Fri, Apr 27, 2018 at 9:09 PM mohan prakash via nginx <nginx at> wrote:

Hi Team

I am trying execute ~1000 curl request from my CentOS machine to my nginx server in ~5 sec.
The same exercise continuous every ~5sec.

I am using libcurl to make the HTTP request.

During this process i see most of my request are failed with reason

Failure Curl Error Code[ 7 ] Reason[ Couldn't connect to server ]

Can someone suggest whether i am missing any configuration info in my nginx server. Below is my nginx server configuration

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/;

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

worker_rlimit_nofile 262144;

events {
    worker_connections 16384;

http {
    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  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    limit_conn_zone $binary_remote_addr zone=perip:10m;
    limit_conn_zone $server_name zone=perserver:10m;

    server {
        limit_conn perip 2000;
        limit_conn perserver 20000;
        listen *:8080 backlog=16384;

RegardsMohanaprakash T
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