I don't see anything obviously wrong with your code after a cursory
glance. I assume you're familiar with the bootstrap context issues
mentioned in TN2083 and elsewhere?

If you can post a complete example that exhibits the problem, I'd be
happy to investigate further. However, consider using NSMachPort
instead of CFMessagePort; you can lose a lot of code in doing so.
Here's an example showing how to set up a client and server using
NSMachPort and NSMachBootstrapServer:

    http://pastie.org/1435791

This code would of course work the same if the client and server were
in separate processes, assuming the server port is registered in a
bootstrap context that's visible to the client.

> Is there any utility to maybe probe the Mach ports that my app has open?  I 
> can't find anything like that.

top(1) and Activity Monitor can list the number of ports a process has
open, but I'm not aware of any utilities that go into any more detail.
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