I want to create multi-site in WordPress but when I add the following line in 'wp-config.php' file of the wordpress
"define( 'WP_ALLOW_MULTISITE', true );"
Then in admin panel of wordpress, In Tool tab Network Setup, when I am selecting a sub-domain option for multi-site and submit it then I got following warning :
"Warning! Wildcard DNS may not be configured correctly!
The installer attempted to contact a random hostname (b870a2.stidev.info) on your domain. This resulted in an error message: Couldn't resolve host 'b870a2.stidev.info'
To use a subdomain configuration, you must have a wildcard entry in your DNS. This usually means adding a * hostname record pointing at your web server in your DNS configuration tool.
You can still use your site but any subdomain you create may not be accessible. If you know your DNS is correct, ignore this message."
Due to that warning I am not able to setup the multi-site. Can you please help me to setup a multi-site in WordPress.