nginx erreur it didn't open

please nginx in my server did start please follow me

root@s45-****:/home/arabico# nmap 45.****

PORT   STATE SERVICE
22/tcp open  ssh
5/tcp open  smtp
80/tcp open  http

Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds
root@s45-****:/home/arabico# sudo service apache2 stop
 * Stopping web server apache2                                                      * 
root@s45-****:/home/arabico# nmap 45.****

Starting Nmap 6.40 ( http://nmap.org ) at 2015-06-05 19:33 MST

PORT   STATE SERVICE
22/tcp open  ssh
25/tcp open  smtp

Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds
root@s45-***:/home/arabico# sudo service nginx restart
 * Restarting nginx nginx          
          [fail] 


root@s45-***:/home/arabico# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)
nginx: configuration file /etc/nginx/nginx.conf test failed

root@s45***:/home/arabico# sudo nginx
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)

how to let it start please

nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)

From the error message this seems ipv6 is disabled on your server. Edit nginx default server configuration and changed it to listen on ipv4 only or enable ipv6.

listen 80 default_server;
# comment to disable ipv6
# listen [::]:80 default_server;

just i deleted this line

listen [::]:80 default_server ipv6only=on;

from

/etc/nginx/sites-available/default and it works :D