Fixing ECONNREFUSED Error

The ECONNREFUSED error indicates that when the Apidog client attempted to connect to the target server at the specified IP address and port, the connection was refused.

Possible Causes

This error is typically not caused by Apidog itself but stems from issues with the target server, network configuration, or local settings. Major causes include:

1. Target service is not running

The API service or application you are trying to reach is not started on the server or has crashed at the time of the request.

2. Incorrect address or port

The IP address, hostname, or port specified in the Apidog request URL is incorrect; the server is not listening on that endpoint.

3. Server-side firewall blocking connections

The server’s firewall or cloud security group is configured to block connections from the Apidog client. The server receives the connection attempt but actively refuses it.

4. Client-side firewall blocking connections

Your local machine’s firewall or security software is preventing the Apidog application from making outbound network connections.

5. Proxy misconfiguration

Apidog is configured with incorrect proxy settings, so requests fail to reach the target server.

How to Troubleshoot and Fix

Follow these steps to identify and resolve the issue:

1. Install the browser extension or use the desktop app

If you are using the web version, install the browser extension before resending requests.
Alternatively, use the Apidog desktop app (recommended for greater stability).

2. Verify the target service status

Start or restart the service: Make sure the target API/service is up and running on the host (server or local machine).

Check service logs: Review the server application logs for errors or crashes around the time you attempted the connection.

3. Validate connection details

Check the port: Confirm the port in your Apidog request URL (for example, http://127.0.0.1:3000/api/users) matches the port the service is actually listening on.

Verify the address: Ensure the IP address or domain name is correct. If using localhost or 127.0.0.1, confirm the service is running locally.

4. Inspect firewall and security settings

Server firewall / security group: If the API is hosted remotely, confirm the server firewall or cloud security group allows inbound connections to the target port (e.g., 80, 443, 3000). Contact the server administrator if necessary.

Local firewall / antivirus: Temporarily disable your local firewall or security software to see if the issue resolves. If it does, add Apidog to the allowlist rather than leaving protections disabled.

5. Check Apidog proxy settings

Open Apidog → Settings → Network Proxy.

Actions to take:

If you do not need a proxy to reach the target service, ensure proxy is disabled or set to “No proxy”.

If you do require a proxy, verify the proxy host, port, and authentication credentials are correct.

If, after all these checks, the issue persists, engage the server-side administrators or hosting provider and provide them with the request time, source IP (if applicable), and the attempted endpoint so they can inspect server/network logs and firewall rules.

Fixing ECONNREFUSED Error

Possible Causes#

1. Target service is not running#

2. Incorrect address or port#

3. Server-side firewall blocking connections#

4. Client-side firewall blocking connections#

5. Proxy misconfiguration#

How to Troubleshoot and Fix#

1. Install the browser extension or use the desktop app#

2. Verify the target service status#

3. Validate connection details#

4. Inspect firewall and security settings#

5. Check Apidog proxy settings#