The UPnP success message indicates that the port has been opened successfully in the router. The port might be blocked by another router on the network. Are there any other routers on the network? What are the Brand/Model of all routers on the network? What is the Brand/Model of your cable/DSL modem? Some modems have an integrated router that could cause this problem.
Also, you mentioned having Norton installed, please quit or disable all firewall software on the computers running iCamSource (temporarily) to see if iCam starts working. If it does, we can configure the firewall to work with iCam.