Unable to connect to any database in Postgres

[nihalvv]

Hi Everyone,
We're trying to connect a Postgres Source but constantly getting the following error.
Configuration check failed
State code: 08001; Message: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
The postgres config file is listening to localhost and I'm able to form a connection in Dbeaver as well. We're unable to figure out what's wrong and kind of stuck right now.
I've installed using abctl. Using Python 3.11 and Postgres 16.
These are settings : SSL : prefer, xmin replication, no SSH tunneling, localhost, port 5432.
Could someone please help me out?