At apparently random times, our web server stops serving requests. I can find nothing in the server logs that would be a reason for this. All services are still running. To correct, I stop and restart IIS. I've done some searches on line and found where it could be an ASP performance issue. I've searched the error codes and could not find them on my web server. So, I don't think it is an ASP issue. Any ideas.
OS-Windows Server 2012