Andrew Edson <cheighlund(at)yahoo(dot)com> writes:
> Someone else added the IP address for the other system to the
> pg_hba.conf file later, but since we had already started postgres by
> then, it didn't take.
You don't need to shut down the server to adjust pg_hba.conf ... just
"pg_ctl reload".
> And now, for some reason, postgres doesn't seem to want to let me shut
> down.
A standard shutdown doesn't finish until all existing sessions exit of
their own accord. Perhaps you wanted "-m fast"?
regards, tom lane