# IStreamPubSub.FaultSubscription(QualifiedStreamId, GuidId, CancellationToken)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.istreampubsub/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.istreampubsub/methods/)

[Source](https://github.com/dotnet/orleans/blob/1644940b035c7bdf215a4fd7135757c06bcfe9ec/src/Orleans.Streaming/Providers/IStreamProviderRuntime.cs#L226)

```csharp
public virtual Task<bool> FaultSubscription(QualifiedStreamId streamId, GuidId subscriptionId, CancellationToken cancellationToken)
```

Marks a subscription as faulted.

### Parameters

- `streamId` (`QualifiedStreamId`): The stream identifier.
- `subscriptionId` (`GuidId`): The subscription identifier.
- `cancellationToken` (`CancellationToken`): The cancellation token.

### Returns

`true` if the subscription was faulted; otherwise, `false`.