# SiloUnavailableException

Package: [Microsoft.Orleans.Core.Abstractions](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/) 10.0.0

[NuGet package](https://www.nuget.org/packages/Microsoft.Orleans.Core.Abstractions) | [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/Exceptions/SiloUnavailableException.cs#L11)

```csharp
[Orleans.GenerateSerializer]
public sealed class SiloUnavailableException : OrleansMessageRejectionException
```

Signifies that an request was canceled due to target silo unavailability.

## Constructors

- [SiloUnavailableException](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.silounavailableexception/constructors/constructor-fcafca21/)
- [SiloUnavailableException(string, Exception)](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.silounavailableexception/constructors/constructor-string-system-exception-db345a79/)
- [SiloUnavailableException(string)](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.silounavailableexception/constructors/constructor-string-b51dab3d/)