Nifi to Database TCP/IP Connection refused (postgres)(nifi)

[#1]

I'm attempting to insert data into my database but Nifi will not make the connection properly. I've made the connection using Adminer and Data-Grip. Note: I'm running in a docker

[#2]

There is not sufficient information here to give detailed suggestions, but the first two things to check:

1. Is your firewall open between all the NiFi nodes and the DB?

2. Are your credentials correct?