# TunnelError

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/sandbox/_exceptions/TunnelError)

Base exception for TCP tunnel errors.

## Signature

```python
TunnelError()
```

## Extends

- `SandboxClientError`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/ce9e9e8973442b33e98ec3ce1b9c2dd3f58a43a7/python/langsmith/sandbox/_exceptions.py#L294)