# NVIDIARAGConnectionError

> **Class** in `langchain_nvidia_ai_endpoints`

📖 [View in docs](https://reference.langchain.com/python/langchain-nvidia-ai-endpoints/retrievers/NVIDIARAGConnectionError)

Raised when the RAG server endpoint is unreachable.

Common causes:
- RAG server container is not running
- Wrong base_url or port (default: 8081)
- Network/firewall blocking the connection

## Signature

```python
NVIDIARAGConnectionError()
```

## Extends

- `NVIDIARAGError`

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[View source on GitHub](https://github.com/langchain-ai/langchain-nvidia/blob/5bfb68d5b10aa0330a6b79a36375b9bc0c6acef7/libs/ai-endpoints/langchain_nvidia_ai_endpoints/retrievers.py#L34)