If your VestaCP has more than one user account, you have to do step 1 and step 2. If not, you can jump to step 3 directly.
- Open the config file with any editor: /etc/httpd/conf.d/vesta.conf
- Move the preferred user to the top of this file.
- Open /home/admin/conf/web/httpd.conf
- Move the preferred VirtualHost to the top of this file.
- Restart the apache server
service httpd restart