Cygwin systems seem to have a different error message when trying to connect to port 0. Let's try port 20 instead.

Michael Meskes <meskes@postgresql.org>

Commit: 4eef745fb19f93725d50de093c6747fb60149b75
Author: Michael Meskes <meskes@postgresql.org>
Date: 2006-09-14T08:46:58Z
Releases: 8.2.0
Cygwin systems seem to have a different error message when trying to connect to port 0. Let's try port 20 instead.

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