Peter
I'm using DNN4.9.1 and DMX5.0.2. I've set up IIS6 and double-checked that our configuration matches that outlined in your IIS setup document. Everything DMX-wise is working satisfactorily, but I'm now having issues getting IIS to redirect 404 errors to a custom error page created in DNN. This may be unrelated to DMX, but I'm wondering just in case if this is a conflict you've enocuntered before?