Keith,

I wish people whould read these threads carefully before sending people on a wild goose chase. I had the excact problem your having and found the problem to be with IIS and the way the soap isapi listener is installed and a bug in the property setup of IIS dialog to register the soap listener. I have not been able to get it to work. The asp listener works fine and I suspect this is what everybody is using to make it work. The problem with the asp listener is once it is instancated it locks the com object and I have to reboot to update my dll.
I have sent messages to people that I thought would help with these issues and have received no response. I hope this gets you started and does'nt make you mad like it did me.