Domain doesn't work without `www`

All you need is to add the following code to your root .htaccess file:

RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

With the current version of apache, you need to do the following, which has changed compared to the previous versions:

cd /etc/apache2/sites-enabled

Now find the config file for your domain and edit it (the first three lines after <VirtualHost *:80> is what we need here):

<VirtualHost *:80>
        ServerName www.yourdomain.com
        ServerAlias yourdomain.com *.yourdomain.com
        ServerAdmin webmaster@localhost

        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>

</VirtualHost>

And now after saving changes to the file, you should reload Apache we server configuration with:

service apache2 reload

and it'll work!

P.S. You may also want not to add *.yourdomain.com to the end of your ServerAlias line.

to solve this issue

• suppose you want mysubdomain.domain1.com

• goto your dns records settings in your web panel ( cpanel , vestapanel etc ) of domain1.com

• add there new A record with ip of your domain1.com and fill record/hostname field with @ // @ mean no www if you want www too then add another new A record and replace @ with www

• save it

• wait for dns changes to take place maybe take few hours