I've got a simple peer-to-peer network at home, two Windows XP Pro desktops and one Windows XP Pro notebook. I've written an ASP.NET application which runs in IIS on one of the machines, and the other two machines to reach my ASP.NET site just fine. Recently I put Trend Micro's PC-cillin Internet Security 2005 onto all three machines. Now none of the other two machines can reach my ASP.NET site. Why is that? Rod