---
title: ROUTER_EXTERNAL_TARGET_CONNECTION_ERROR
product: vercel
url: /docs/errors/ROUTER_EXTERNAL_TARGET_CONNECTION_ERROR
type: reference
prerequisites:
  []
related:
  - /docs/redirects
  - /docs/deployments/logs
summary: Connection error occurred while routing to an external target. This is a routing error.
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---

# ROUTER_EXTERNAL_TARGET_CONNECTION_ERROR

The `ROUTER_EXTERNAL_TARGET_CONNECTION_ERROR` error occurs when there is a connection error while routing to an external target. This could happen due to network issues, incorrect routing configuration, or the external target being unreachable.

**Error Code:** `502`

**Name:** Bad Gateway

## Troubleshoot

To troubleshoot this error, follow these steps:

1. **Check network connectivity:** Ensure that the network connectivity between your deployment and the external target is stable
2. **Verify external target availability:** Make sure the external target is online and reachable
3. **Review routing configuration:** Check the [routing configuration](/docs/redirects#configuration-redirects) to ensure that it is correctly set up to route to the external target
4. **Inspect firewall settings:** Verify that there are no firewall settings blocking the connection to the external target
5. **Review application logs:** Inspect the [application logs](/docs/deployments/logs) for any warnings or errors related to routing or network connectivity


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