Error: connect ECONNREFUSED 127.0.0.1:8081 in postman - postman

Question

I have a created a flow in the Mulesoft's Anypoint platform with the HTTP listener and now trying to test the flow by exposing that API through postman locally.
Below is the messgae from error console
GET http://localhost:8081/test
Error: connect ECONNREFUSED 127.0.0.1:8081
Request Headers
User-Agent: PostmanRuntime/7.28.1
Accept: */*
Cache-Control: no-cache
Postman-Token: 92ca3330-3dd3-4bfc-a183-f3cb4f22f469
Host: localhost:8081
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Understood a bit that some proxy settings and made those changes but still couldn't resolve this

Answer 1

I was getting the same warning from postman, I later found that
i was excluding port in my setting.
It will be nice if you include your code, but you can use the below setup...
const express = require("express");
const app = express();
const port = process.env.PORT || 3000;
app.post("/users", (req, res) => {
res.send("testing...")
})
app.listen(port, () => {
console.log("Server is running at port ", port);
})

Answer 2

With absence of source file/snapshot, couple of things to look at:
Please check in your local mule Configuration file contains API Auto Discovery and is enabled, Comment it out and try again.
RCA: if this config is enabled then even local request is first redirecting to API manager who is not approving your connection request.
Ps: Remember to un-comment before committing
Verify the port number is correct
RCA: sometimes port number is provided different
Verify host for the listener is configured to localhost
RCA: sometimes host is set different
Check if right configuration file is being read for listener.
RCA: Maybe in config global variable maybe set dev instead of local hence dev properties are being read instead of local.