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Make sure your PostgreSQL client is the same version as the server’s.
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Make sure you introduced the correct username/password when configuring the database on the PowerServer project. Also verify you’re using the appropriate SSL settings for the connection. They should match the server’s settings.
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Edit the %PostgreSQL%\13\data\pg_hba.conf file to allow remote connections
host all all 0.0.0.0/0 md5