Hardware firewall and much much more
As the dot com era died, so did many hosting companies that were not able to provide good service. What is the current state of server colocation services? There are certainly still companies that over promise and under deliver. All in all, the solid server colocation companies shine through from those who will not provide good service. Also, the technical issues that were common in the early days are gone. Much of the core routing and load balancing equipment has been through many versions of development.