Linux website nginx crashed

[Xavicrak]

Hello
my website down. only its work sometimes when i reload alot(F5)
im using nginx on ubuntu 12.04

in error.log appear

2014/03/26 01:46:46 [alert] 4063#0: 768 worker_connections are not enough

here is my nginx.conf

user www-data;
worker_processes 4;
pid /var/run/nginx.pid;

events {
    worker_connections 768;
    # multi_accept on;
}

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    # server_tokens off;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

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

    ##
    # Logging Settings
    ##

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    gzip on;
    gzip_disable "msie6";

    # gzip_vary on;
    # gzip_proxied any;
    # gzip_comp_level 6;
    # gzip_buffers 16 8k;
    # gzip_http_version 1.1;
    # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    ##
    # nginx-naxsi config
    ##
    # Uncomment it if you installed nginx-naxsi
    ##

    #include /etc/nginx/naxsi_core.rules;

    ##
    # nginx-passenger config
    ##
    # Uncomment it if you installed nginx-passenger
    ##
   
    #passenger_root /usr;
    #passenger_ruby /usr/bin/ruby;

    ##
    # Virtual Host Configs
    ##

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}


#mail {
#    # See sample authentication script at:
#    # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#    # auth_http localhost/auth.php;
#    # pop3_capabilities "TOP" "USER";
#    # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#    server {
#        listen    localhost:110;
#        protocol  pop3;
#        proxy      on;
#    }
#
#    server {
#        listen    localhost:143;
#        protocol  imap;
#        proxy      on;
#    }
#}

some idea?
thanks in advance

 

[Techrlz]

I reccomend to install apache2.

 

[Xavicrak]

i try run this script iptables
http://otland.net/threads/ddos-protection-script-for-iptables.168154/

but i got this error "kernel not found" because its a dedicated server from ovh,
and not have native kernel.

 

[Znote]

Your connections are not properly shutting down. Does this happen frequently? Do you tend to get attacked often?

Due to my inexperience with nginx I would recommend lighttpd. (not apache, its so bad on linux).

 

[underxtibia]

If you are running traffic sites a lot, its better to increase value of worker_connections.
Default is 768.

Nginx can handle max clients = worker_processes * worker_connections

Change to worker_connections = 10240 and try again!