Disable Port 32000+

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How does one disable tcp access on ports at or about 32768?
When I start X with startx, this port doesn't seem to be used,
and the -nolisten tcp option makes sure that port 6000 isn't
used either. However, when I use xdm, the -nolisten tcp option
still turns off port 6000, but a netstat -ap shows that xsm is
listening on port 32768 (or 32769, or something similar).  I
have DisplayManager.requestPort 0 in xdm-config, but it doesn't
seem to work.  I can't find anything in the xdm or xsm
documentation that speaks to this - everything I have found
suggests that -nolisten tcp ought to turn off remote access,
and it does turn off port 6000, but not port 32768.  I don't
really want these ports turned on until I fully understand the
security implications.

A.

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