> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_NOT_ALLOWED: Environment variable KEY is reserved

> ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_NOT_ALLOWED: Environment variable KEY is reserved. Learn why ngrok returns this error and how to fix it.

## What does ERR\_NGROK\_SHIP\_ENVIRONMENT\_VAR\_KEY\_NOT\_ALLOWED mean?

ngrok returns ERR\_NGROK\_SHIP\_ENVIRONMENT\_VAR\_KEY\_NOT\_ALLOWED with this message:

```text theme={"theme":{"light":"css-variables","dark":"css-variables"}}
Environment variable <KEY> is reserved. ngrok sets 'PORT' and the 'PORT_' variables from the endpoint templates.
```

> [!TIP]
>
> Troubleshoot ERR\_NGROK\_SHIP\_ENVIRONMENT\_VAR\_KEY\_NOT\_ALLOWED with your AI agent.
> Connect it to the [ngrok MCP server](https://ngrok.com/docs/mcp-server.md), then ask what caused the error and how to fix it.

## Where can I get more help with ERR\_NGROK\_SHIP\_ENVIRONMENT\_VAR\_KEY\_NOT\_ALLOWED?

Email [support@ngrok.com](mailto:support@ngrok.com?subject=Help%20with%20ERR_NGROK_SHIP_ENVIRONMENT_VAR_KEY_NOT_ALLOWED) and include the error code.


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