NIS stealing low-numbered ports?

[Aaron Mandel]

I'm running 4.7, using both NIS and cups. There has now twice been a
problem where printing via cups started failing because cups couldn't open
UDP port 631 to talk to the cups server, and both times, when I looked,
there was an sshd belonging to some random (logged-in) user claiming that
port. I found a short thread in the list archives from a few months ago
saying that this was normal behavior with NIS, but shouldn't it be taking
higher-numbered ports? The range of ports it uses seems to be about
600-1024; if there's a way to configure those numbers, we haven't found
it.

Has anyone else had this problem and found a satisfactory solution?

aaron