About worker_connections?

i have set worker_connections 10024 ,but i user the loadrunner to test
it user about 1000 user,it only can pass 700 user,how to resove the max
connections?
There is error message:
Action.c(4): Error -27796: Failed to connect to server “19.16.8.187:80”:
[10061] Connection refused
Action.c(4): Error -26610: HTTP Status-Code=502 (Bad Gateway) for
http://19.16.8.187/gdceportal/index.aspx

There is my nginx config:

#user nobody;
worker_processes 1;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid logs/nginx.pid;

events {
worker_connections 10024;
}

http {
include mime.types;
default_type application/octet-stream;

#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  logs/access.log  main;

sendfile        on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  120;

#gzip  on;

upstream 19.16.8.187{

ip_hash;

server 19.16.8.188:80;
server 19.16.8.189:80;
}

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,226129,226129#msg-226129

did you modify the system fd limitation?