nginx not restarting after changing port

Question

I have tried to change the port in which nginx listens for from 80 to 6000. However I get this when I try to restart it.

Restarting nginx: nginx: [emerg] bind() to 0.0.0.0:6000 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:6000 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:6000 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:6000 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:6000 failed (98: Address already in use)
nginx: [emerg] still could not bind()

This is my sites-enabled setup.

server {
    listen   6000; ## listen for ipv4; this line is default and implied
    #listen   [::]:80 default_server ipv6only=on; ## listen for ipv6

    root /var/www/mywebsite.co/html;
    index index.html index.htm;

    # Make site accessible from http://localhost/
    server_name mywebsite.co www.website.co;

    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ /index.html;
            # Uncomment to enable naxsi on this location
            # include /etc/nginx/naxsi.rules
    }

    location /doc/ {
            alias /usr/share/doc/;
            autoindex on;
            allow 127.0.0.1;
            allow ::1;
            deny all;
    }
}

I have a feeling the 0.0.0.0:6000 should be the ip address in which the server is held on e.g 192.168.1.3:6000 however I am not sure how to do this. Any help would be appreciated thanks.

Answer 1

Try changing #listen [::]:80 default_server ipv6only=on; ## listen for ipv6

To: listen [::]:6000 ipv6only=on default_server;

If that doesn't work, you could netstat -natp | grep 6000 to see more info.

Answer 2

TCP port 6000 is the port normally used by the X Window system. If you're on a UNIX-ish system that's not a Mac and you're using a GUI, then port 6000 is most likely already in use by the X server running on the local machine. That's why nginx is failing to bind to it.

Answer 3

to find out whats running on a well known port (ie tcp/6000), you could do something like, as root:

for i in $(grep [WELLKNOWNPORT] /etc/services|awk '{print $1}'); do lsof|grep $i; done