With our virtual servers, based on xen, you get full root access to your server and are able to install any software you like. You are free to allocate all network ports or restrict them with your own firewall. The drawback to virtual is that you share the hardware with a few others. We use fair scheduling mechanisms to make sure everybody gets their share of the resources available on the host server. Also we never oversell the hardware platform, ensuring a fast response time of your software.