# IClusterConnectionStatusObserver.NotifyClusterConnectionLost

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.iclusterconnectionstatusobserver/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.iclusterconnectionstatusobserver/methods/)

```csharp
public abstract void NotifyClusterConnectionLost()
```

Notifies this observer that the connection to the cluster has been lost.