Increasing the number of supported network interfaces in the Kerio Control VMware Virtual Appliance
Kerio Control Virtual AppliancePre-configured Kerio Control virtual machine image for VMware or Hyper-V. does not limit the number of network interfaces. However, based on the default virtual hardware version of the Kerio Control Virtual Appliance, the maximum number of allowed interfaces is 4.
Upgrading the virtual hardware
You can increase the number of supported interfaces by upgrading the virtual hardware. Refer to upgrading a virtual machine to the latest hardware version located in VMware's knowledge base.
Hardware limits based on VMware vSphere 5.0 are available here.