I've recently installed XP Pro and its' IIS, off the CD. I'm getting an HTTP 500 error on attempts to load either asp (or even html) pages on localhost, but only when my internet connection is enabled. If I disconnect, I can successfully surf to these pages. I'm running the firewall that comes with XP, and have tried disabling firewall while maintaining my (cable) connection. The problem remains. I believe that I've correctly set my permissions. (I've a workstation in my classroom that runs IIS on Win200, so I've tried to match those permissions.) But given the localhost is reachable when I disconnect from my isp network, I suspect that the permissions are not the issue here.<BR>I've searched several sources but cannot find information that others have encountered this difficulty. <BR>Does anyone have any suggestions? You help would be appreciated.