Update: I see now that you say (updated the node?) that connecting with psql is OK. That means the below is not the problem /Update

On the postgres server side, in postgresql.conf, what is the value of 'listen_addresses' ?

https://www.postgresql.org/docs/current/static/runtime-config-connection.html#GUC-LISTEN-ADDRESSES

It might need to be changed to, for instance, '*' (all interfaces).