And unlike at a collocation facility, whose administrators would need access to his servers in case they cause trouble for other customers, Agora's own admins are the only ones with the authority to touch his virtual servers. As for network security, says Corrigan, "We went from having a stack of physical servers with publicly accessible IP addresses to a slew of virtual machines with private IP addresses behind a software firewall. We can manage all of the firewall rules in one place, installing less restrictive generic rules on the actual VMs."