Connection to localhost:5432 refused on nifi UI

[#1]

Hello. Im currently running nifi and postgresql on docker compose. I have a problem setting up the DBCPConnectionPool controller. I keep getting the error message below.

Below is my configuration for DBCPConnectionPool 

I have checked the db name and docker compose yml file but nothing seems wrong on that end. What could be causing the problem here? 

[#2 · Accepted solution]

Ok just in case anyone is suffering from the same problem as me.

Since I am running this on docker compose,

instead of localhost:5432, I changed it to <container name>:5432 and its working now