I have configured an ISA server as a caching proxy behind an external firewall. I am also running Trend Micro WebProtect virus scanning on the ISA server. Currently everything is working correctly, but before I can put this box into production, I would like to stress test it. I have tried using the Web Application Stress Test (WAST) tool from Microsoft, but I can't get ISA to proxy my requests. I am receiving a 407 Error, (Proxy Authentication Required) from the ISA server. I also tried to load up the WAST service (webtool) with my user account to allow proxy access to no avail. So I loaded up the ISA Firewall client thinking this would give me access to the proxy to no avail. If anyone knows how to stress test ISA server, any help would be greatly appreciated. Paul P-)