You have to tell Norton to allow the laptop to access the network as it is stopping it doing so (obviosuly). It is treating the laptop as one of the millions of machines around the world.
I do not use Norton myself. So what if what i say next makes no sense to you someone with Norton will come along and tell you :-)
Within Norton, there might be "Zones" you have to tell norton the IP Address of the laptop to allow the laptop to connect.