Network Load Balancing in Windows

I am using NLB on a prototype I am working on. I have a custom process that listens to custom port and I have two Windows 2008 boxes to act like a web farm. The quick gotcha is that if my process is down but the network on the machine is still up NLB will try to distribute the network load around the two nodes. I was hoping for something a little bit smarter (like figuring out the port has not listener) but that is not the case.