.net framework temporary files - hash.web locked


My firewall is locking a temporary file and I can’t find a way around it. I used visual studio .net to create a web application. On the 2nd or 3rd time I try running it from visual studio I get an error message that a file is in use (hash.web). If I reboot I can run the app again, but it will lock up after a few tries?

C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET Files\myWebApp\a12ae28a\49e740c7\hash.web