Unable to start nginx: Not starting nginx as it is disabled in config

Symptoms

• Nginx is stopped:

  # service nginx status
  nginx is stopped

  OR

  # service nginx status
  nginx dead but pid file exists

• Cannot start Nginx:

  # /etc/init.d/nginx start
  Not starting nginx as it is disabled in config

• nginx service is disabled in:

  • CentOS/RHEL:

    # cat /etc/sysconfig/nginx
    NGINX_ENABLED=no

  • Debian/Ubuntu:

    # cat /etc/default/nginx
    NGINX_ENABLED=no

• Nginx error log file at /var/log/nginx/error.log contains the following line:

  CONFIG_TEXT: [emerg] 2060#0: duplicate listen options for [2001:db8:f61:a1ff:0:0:0:80]:80 in /etc/nginx/plesk.conf.d/server.conf:29

• Websites are down, or display Apache/Plesk Default Page:

  CONFIG_TEXT: Problem loading page

  OR:

  CONFIG_TEXT: Apache default page

• Webmail is not accessible on port 80 but works on port 7080:

  CONFIG_TEXT: ERR: Connection refused

Cause

Nginx is disabled for starting in it's configuration

Resolution