After installing postgresql
Edit the pg_hba.conf
usually
/var/lib/pgsql/data/
under the line
# TYPE DATABASE USER ADDRESS METHOD
comment out all the lines using #
and then add
host all all 127.0.0.1/32 trust
and
host all all 192.168.0.0/24 trust
and that seems to work. I can log in to the server over my local network using DataGrip.