On Mon, 7 Jun 2021, Alan Hodgson wrote:
If you don't specify a host name, psql/libpq connects using the UNIX domain socket in /tmp. If you do specify a host name it connects using a TCP socket. Your PostgreSQL doesn't seem to be listening on TCP, or possibly you have a firewall issue.
Alan, The firewall is external to this host. It's a Ubiquiti ER-X between the FiOS and the switch connecting all hosts. Thanks, Rich