On 25 sep 2009, at 02.59, Tom Lane <t...@sss.pgh.pa.us> wrote:

Sam Mason <s...@samason.me.uk> writes:
+        if (portnum < 1 || portnum > 65535)

BTW, it strikes me that we could tighten this even more by rejecting
target ports below 1024.  This is guaranteed safe on all Unix systems
I know of, because privileged ports can only be listened to by root- owned
processes and we know the postmaster won't be one.  I am not sure
whether it would be possible to start the postmaster on a low-numbered
port on Windows though.  Anyone know?  Even if it's possible, do we
want to allow it?

Windows doesn't care. A non privileged process can open any port, both above and below 1024.

Other than that, I agree with previous comments - restricting this in libpq won't actually help anything, but in a few limited cases it will be very annoying.

/Magnus



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