Hello again-- Things have been going relatively well with my new ISA 2000 setup. Until this morning. I have ISA 2000 running standalone on a Windows 2003 box. I've been having trouble getting the Message Screener to work. I installed IIS on the ISA box on Monday. Mail flows to my test domain. But the message screener doesn't seem to work. I set, among other extensions, a made up extension "*.xxx" to be deleted. They go through anyway. I thought maybe I needed to install the Message Screener itself. I ran the installer from the CD, installed Message Screener, and rebooted. That broke a bunch of stuff. I tried re-installing the ISA SP1, Feature Pack 1, and the hot fix isahf255.exe. Most everything went back to normal, except: 1. The Message Screener still doesn't work. 2. When I use the ISA server as the default gateway for our main internal DNS server, DNS stops working (that is, no machines, including the main internal DNS server, will find any external sites). As long as our main internal DNS server has our old firewall as its gateway, all the other machines can use the ISA server as their gateway with no problem. (I don't know for certain that this behavior just started with my Message Screener re-install, as I just switched the gateway on the DNS server this morning.) Any idea what might be up with these two things? Thanks, Rob