Install a firewall for Windows   IMPORTANT NOTE:   Never assume the directory structures exist in your system as written in the document.  Never blindly follow security instructions -- read, review, compare, apply as it fits your system. At present we've only found two firewalls that work well with Windows 200x based servers: ipsec (built into Windows)   Visnetic Firewall Please see http://www.psoft.net/HSdocumentation/sysadmin/preparing_servers.html#ports for a list of what ports need to be open for Parallels H-Sphere to work properly. IMPORTANT NOTE:  This document and all linked document is being provided as a good will gesture to the Parallels H-Sphere community and to others who may benefit from its use.  Dynamic Net, Inc. makes no representations implied or explicit as to their value or warranty. Dynamic Net, Inc. will not be held liable for any damage resulting in the application of the steps and procedures noted.  If you feel uncomfortable at all about doing any of the steps, make a complete system backup and hire a third party like We Manage Servers to do the work for you.