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Update troubleshoot.md (#24278) 

Co-authored-by: Luke Latham <1622880+guardrex@users.noreply.github.com>
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James Newton-King 2021-12-13 12:29:23 +13:00 committed by GitHub
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aspnetcore/grpc/troubleshoot.md
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@ -76,7 +76,6 @@ There are some additional requirements to call insecure gRPC services depending
* .NET 5 or later requires [Grpc.Net.Client](https://www.nuget.org/packages/Grpc.Net.Client) version 2.32.0 or later.
* .NET Core 3.x requires additional configuration. The app must set the `System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport` switch to `true`:
```csharp
// This switch must be set before creating the GrpcChannel/HttpClient.
AppContext.SetSwitch(
@ -89,6 +88,9 @@ There are some additional requirements to call insecure gRPC services depending
The `System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport` switch is only required for .NET Core 3.x. It does nothing in .NET 5 and isn't required.
> [!IMPORTANT]
> Insecure gRPC services must be hosted on a HTTP/2-only port. For more information, see [ASP.NET Core protocol negotiation](xref:grpc/aspnetcore#protocol-negotiation).
## Unable to start ASP.NET Core gRPC app on macOS
Kestrel doesn't support HTTP/2 with TLS on macOS and older Windows versions such as Windows 7. The ASP.NET Core gRPC template and samples use TLS by default. You'll see the following error message when you attempt to start the gRPC server: