As reported to the support forum today by Justin:
You need to add in support for IPv6 support for your installation. It took me about 5 hours of work yesterday to figure out what the problem really is. Try adding something like this to the pg_hba.conf file:
host all all ::1/128 password
You might also need to make a hostssl and hostnossl as well. I did both just to make sure. I hope this helps you.
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