# libtmux.Server.raise_if_dead

- **Module:** libtmux
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/server.py#L299
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-server-raise_if_dead/

```
libtmux.Server.raise_if_dead(self) -> None
```

Raise if server not connected.

## Raises

- [`exc.TmuxCommandNotFound`](/en/py/stable/reference/libtmux-exc-tmuxcommandnotfound/): When the tmux binary cannot be found or executed.
- [`subprocess.CalledProcessError`](https://docs.python.org/3/library/subprocess.html#subprocess.CalledProcessError): When the tmux server is not running (non-zero exit from
``list-sessions``).
- `>>> tmux = Server(socket_name="no_exist")`
- `...     tmux.raise_if_dead()`
- `...     print(type(e))`
- `<class 'subprocess.CalledProcessError'>`

## In other ports

### Fail unless the server is answering

- TypeScript: [`server.Server.raiseIfDead`](/en/ts/latest/reference/server-server-raiseifdead/) (method)
- Go: [`tmux.Server.CheckAlive`](/en/go/latest/reference/tmux-server-checkalive/) (method)
- Java: [`io.github.libtmux.Server.Server.requireAlive`](/en/java/latest/reference/io-github-libtmux-server-server-requirealive/) (method)
- C#: [`LibTmux.Server.ThrowIfDeadAsync`](/en/csharp/latest/reference/libtmux-server-throwifdeadasync/) (method)