I keep getting the "Back to my mac isnt working properly because you may have more than one device on your network providing NAT" error.. I have a linksys wireless N router and uPnP is a lost cause as far as I'm concerned with linksys routers. I've never gotten anything to port forward correctly with it. Is there a set of ports and instructions to get it to forward correctly so I can use Back to My Mac between my home and office computer and Laptop? Thanks in Advance!!