First, you need to enable the vhost config in lighttpd:
sudo sed -i '/^#.*vhosts\.d\/\*\.conf/ s/^#//' /etc/lighttpd/lighttpd.conf
Finally create the lighttpd docket vhost log dir
sudo mkdir -p /var/log/lighttpd/docket
sudo chown lighttpd:lighttpd /var/log/lighttpd/docket
NOTE If you want to use a network socket instead of the UNIX socket, you need to allow lighttpd to perform a network connect in the SELinux policy. You can do that like this:
sudo setsebool httpd_can_network_connect 1