This is my BIGGEST concern. In trying to get my HR20 to be able to media share with WMP on Vista, within the firewall rules, I had to create an additional rule under SYSTEM, for certain traffic. After creating the rule, it does take, but is never visible, within the list of rules(at least not under SYSTEM, where I created it), therefore, unchangeable/undeletable. I reported this issue in the first beta and then in RC1, but never got a response. Having rules create themselves and then disappear, becoming uneditable/unremoveable is a serious security risk IMO. I hope this has been addressed in the release version.