CentOS 7 x86_64
It is easier to use fully configured web filtering virtual appliance for VMware vSphere/ESXi from our site.
Support for CentOS 7 operating system is experimental only and it is not generally recommended for mission critical production environments. Please use this system in non critical deployments, labs and experiments only. For mission critical production deployments it is recommended to use Ubuntu 16 LTS x86_64.