Originally Posted by Gideon
Yeah, that's kind of my thinking as well. I played with some of the port forwarding on the router but nothing really helped. But I also get the impression it's a bit more complicated than that.
And the software firewall on the mac took a real hit in customization in the last OS release.
Even if you change a whole bunch of port forwarding rules on your router, if the PC or Mac hosting the Calibre server is blocking access, it isn't gonna do jack.