I have a business intelligence application called Qlikview that I am trying to install on a Windows Server 2003 SP2 64-bit machine. The application has several services that run, and they typically use ports 8081 - 8083. Usually what happens is when you start the services, you see the server listening on the ports in netstat. Ports 8082 & 8083 are working fine, but 8081 doesn't seem to want to listen. I've contacted the vendor and they have never experienced this issue before. There are no other applications trying to use the port so there are no conflicts. Is there something on the OS level that could prevent this port from being used? Any suggestions would be greatly appreciated.