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Mainland avatar Ubuntu

Could not connect to PostgreSql Server (computer) from a client (Raspberry PI)

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Mainland

I followed the instructions as: https://ubuntu.com/server/docs/databases-postgresql This is what I did:

Postgresql-server (On my Ubuntu desktop computer)

# Installed the Postgresql server 
# Went to the sudo nano /etc/postgresql/14/main/pg_hba.conf 
# entered following line at end: 
# My understanding of below line is allow the connection to the  
# this ubuntu computer (10.1.2.3) from a 
# remote device with ip 10.1.2.4 with user postgres
hostssl template1       postgres        10.1.2.4            scram-sha-256

# This device ip on which Postgresql server is sitting: 10.1.2.3

Postgresql-client (On the remote Raspberry PI device) (ip: 10.1.2.4): This is what I did:

# Install Postgresql-client 
# access the Postgresql-server as 
psql --host 10.1.2.3 --username postgres --password --dbname template1

Present output on the Postgresql-client:

psql error: could not connect to server: connection refused
             Is the server running on host 10.1.2.3 and accepting 
             TCP/IP connections on port 5432?

First time I heard about this port 5432. I would like to know what is wrong and how to rectify it?

Update:

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