I am setting up nginx as a reverse proxy. The server runs on directadmin and lamp stack.

I have nginx running on port 81.

I can access all my sites (including virtual ips) on the port 81. However when I forward the traffic from port 80 to 81, the virtual ips have a message saying "Apache is running normally". Server IPs are fine, and I can still access virtual IP's on 81.

   [root@~]# netstat -an | grep LISTEN | egrep ":80|:81"
tcp 0 0 <virtual ip>:81 0.0.0.0:* LISTEN
tcp 0 0 <virtual ip>:81 0.0.0.0:* LISTEN
tcp 0 0 <serverip>:81 0.0.0.0:* LISTEN
tcp 0 0 :::80 :::* LISTEN

apache 24090 0.6 1.3 29252 13612 ? S 18:34 0:00 /usr/sbin/httpd -k start -DSSL
apache 24092 0.9 2.1 39584 22056 ? S 18:34 0:00 /usr/sbin/httpd -k start -DSSL
apache 24096 0.2 1.9 35892 20256 ? S 18:34 0:00 /usr/sbin/httpd -k start -DSSL
apache 24120 0.3 1.7 35752 17840 ? S 18:34 0:00 /usr/sbin/httpd -k start -DSSL
apache 24495 0.0 1.4 30892 14756 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24496 1.0 2.1 39892 22164 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24516 1.5 3.6 55496 38040 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24519 0.1 1.2 28996 13224 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24521 2.7 4.0 58244 41984 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24522 0.0 1.2 29124 12672 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24524 0.0 1.1 28740 12364 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24535 1.1 1.7 36008 17876 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24536 0.0 1.1 28592 12084 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24537 0.0 1.1 28592 12112 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24539 0.0 0.0 0 0 ? Z 18:35 0:00 [httpd] <defunct>
apache 24540 0.0 1.1 28592 11540 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
apache 24541 0.0 1.1 28592 11548 ? S 18:35 0:00 /usr/sbin/httpd -k start -DSSL
root 24548 0.0 0.0 4132 752 pts/0 R+ 18:35 0:00 egrep apache|nginx
root 28238 0.0 0.0 19576 284 ? Ss May29 0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
apache 28239 0.0 0.0 19888 804 ? S May29 0:00 nginx: worker process
apache 28240 0.0 0.0 19888 548 ? S May29 0:00 nginx: worker process
apache 28241 0.0 0.0 19736 484 ? S May29 0:00 nginx: cache manager process

here is my nginx conf:

 cat /usr/local/nginx/conf/nginx.conf
user  apache apache;

worker_processes     2; # Set it according to what your CPU have. 4 Cores = 4
worker_rlimit_nofile 8192;

pid /var/run/nginx.pid;

events {
  worker_connections 1024;
}

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"';

    server_tokens off;
    access_log  /var/log/nginx_access.log  main;
    error_log  /var/log/nginx_error.log debug;


    server_names_hash_bucket_size 64;
    sendfile on;
    tcp_nopush     on;
    tcp_nodelay    off;
    keepalive_timeout  30;
    gzip  on;
    gzip_comp_level 9;
    gzip_proxied any;

    proxy_buffering on;
    proxy_cache_path /usr/local/nginx/proxy_temp levels=1:2 keys_zone=one:15m inactive=7d max_size=1000m;
    proxy_buffer_size 16k;
    proxy_buffers 100 8k;
    proxy_connect_timeout      60;
    proxy_send_timeout         60;
    proxy_read_timeout         60;

    server {
      listen <server ip>:81 default rcvbuf=8192 sndbuf=16384 backlog=32000; # Real IP here
      server_name <server host name> _;     # "_" is for handle all hosts that are not described by server_name
      charset off;
      access_log  /var/log/nginx_host_general.access.log  main;
      location / {
        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_pass http://<server ip>;    # Real IP here
        client_max_body_size       16m;
        client_body_buffer_size    128k;
        proxy_buffering     on;
        proxy_connect_timeout      90;
        proxy_send_timeout         90;
        proxy_read_timeout         120;
        proxy_buffer_size          16k;
        proxy_buffers              32 32k;
        proxy_busy_buffers_size    64k;
        proxy_temp_file_write_size 64k;
      }
  location /nginx_status {
               stub_status on;
               access_log   off;
               allow 127.0.0.1;
               deny all;
       }
    }
    include /usr/local/nginx/vhosts/*.conf;

}

here is my vhost conf:

# cat /usr/local/nginx/vhosts/1.conf
   server {
      listen <virt ip>:81 default rcvbuf=8192 sndbuf=16384 backlog=32000; # Real IP here
      server_name <virt domain name>.com ;     # "_" is for handle all hosts that are not described by server_name
      charset off;
      access_log  /var/log/nginx_host_general.access.log  main;
      location / {
        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_pass http://<virt ip>;    # Real IP here
        client_max_body_size       16m;
        client_body_buffer_size    128k;
        proxy_buffering     on;
        proxy_connect_timeout      90;
        proxy_send_timeout         90;
        proxy_read_timeout         120;
        proxy_buffer_size          16k;
        proxy_buffers              32 32k;
        proxy_busy_buffers_size    64k;
        proxy_temp_file_write_size 64k;

      }
}