Firewall Security Requirements for Postgresql Access

Is opening up port 5432 (R/W both directions) all that is required
of a firewall in order to access a postgres database outside the
firewall?
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%  Randy Yates                  % "My Shangri-la has gone away, fading like
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%%%% <yates@ieee.org>           % 'Shangri-La', *A New World Record*, ELO
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