I have an MBP which is always connected via AirPort. When I come back to my desk, I typically plug it into an Ethernet cable, on a different (more trusted) subnet.

If I have any ssh sessions open when I bring up the Ethernet connection (which is of course faster and prioritized above AirPort in SP:Network), the ssh sessions hang. If I notice quickly, I can disconnect Ethernet, finish my work (if possible), and disconnect before plugging back into the Ethernet, but this shouldn't happen. The ssh connections are established on the AirPort interface, which is not disturbed, and should remain usable even when an additional connection is introduced.

I have reproduced this behavior on a PBG4 and an MBP, both using the latest