TCP Open Ports

This will work on any machine connected to the internet.  If the technician is unable to determine if a port is open on the router and has been forwarded properly this utility can be used for troubleshooting.   http://www.yougetsignal.com/tools/open-ports/  also through this utility you can verify the route of the packets leaving your computer all the way to the destination seeing any routers or computers along the way that may be blocking access.