iTunes - Home Sharing - can't connect - HELP!

[RPJones]

I just replaced my old MBP with a new i7, everything is working save for this (so far).

I de-authorized the old machine, authorized the new one, selected home sharing, mounted machines in both directions, opened iTunes on both machines. On both machines I get this message (see attached).

Problem is I can't see where to achieve this. I went to security and turned off the OS Firewall on both boxes, and have no 3rd party FW app.

Is there a place to "allow communication on port 3689"?

 

[Dave Braine]

Not sure if this has anything to do with the firewall error, but, you say that you've deauthorised your old Mac. Does it still have an iTunes account? I believe that both computers must have the same iTunes account for Home Sharing to work.