Postman connect ECONNREFUSED

I’m encountering an issue while testing an API endpoint, and I’d appreciate some guidance.

The error message I received is: “POST http://localhost:8080/v1/collections Error: connect ECONNREFUSED”.

I’m trying to figure out whether this error is related to my request body, a potential network problem, or if there might be something I need to adjust in my proxy settings.

Here’s some additional information:

  • My request headers are provided below.
  • I’m using PostmanRuntime/7.26.5 as the User-Agent.
  • The API endpoint I’m trying to access is running on my localhost at port 8080.

Any insights or suggestions on how to troubleshoot and resolve this issue would be greatly appreciated. Thank you!


The error message you’re encountering, “connect ECONNREFUSED”, indicates that your application attempted to connect to the API endpoint at http://localhost:8080/v1/collections, but the connection was refused.

This error can be caused by various factors, and in this response, we will explore potential solutions and steps to diagnose the issue.

Possible Causes

Server Not Running

The most common reason for this error is that the server hosting your API is not running. In this case, since you’re testing locally (localhost), ensure that your API server is up and listening on port 8080.

Port Mismatch

Check if your API server is configured to run on port 8080. If not, you need to specify the correct port in your request URL.

Firewall or Proxy Settings

Firewalls, proxies, or security software can sometimes block connections to certain ports. Ensure that there are no network restrictions or firewall rules that might prevent your application from accessing

Troubleshooting Steps

Step 1: Verify Server Availability

Start by confirming that your API server is running and accessible. You can do this by opening a web browser and trying to access http://localhost:8080 directly. If it doesn’t work, your server might not be running or is not correctly configured.

Step 2: Check Port Configuration

Verify that your API server is indeed configured to run on port 8080. Check your server configuration files, and ensure there are no conflicts with other applications using the same port.

Step 3: Network Connectivity

Ensure that your computer has network connectivity. If you’re on a corporate network, VPN, or proxy, they might interfere with your local requests. Try accessing other local services to test network connectivity.

Step 4: Proxy Settings

The proxy settings you provided in the error log seem to be related to Postman. Make sure Postman is not configured to use a proxy that might be causing the issue. You can review and disable any proxy settings in Postman.

Step 5: Check Request Headers

While the error message suggests a connection issue, it’s also essential to review your request headers to confirm they match the API’s expected format. Ensure the Content-Type header is set to application/json, and other headers are correctly formatted.


In conclusion, the “connect ECONNREFUSED” error can be caused by a variety of factors, including server availability, port configuration, network issues, and proxy settings. Follow the troubleshooting steps outlined above to pinpoint the exact cause of the problem.

Remember to test your API endpoint with other tools or libraries to rule out any issues with Postman. Additionally, consult your API documentation and server logs for more specific error information.

By systematically eliminating potential causes, you’ll be on your way to resolving this issue and successfully testing your API endpoint.

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