ECONNREFUSED error

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My question:
i just got Postman up and running and I am getting a false error and ECONREFUSED 192.183.0.28:9650 I am trying to connect to my Raspberry Pi to mine Avalance. I am running Ubuntu go version go1.12.2 gccgo (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 linux/arm64

Details (like screenshots):

How I found the problem:
error message

I’ve already tried:
https vs http, disabling SSL Certificate.