diff --git a/release-notes/3.0/preview/3.0.0-preview-known-issues.md b/release-notes/3.0/preview/3.0.0-preview-known-issues.md
index 19587803..1b934a40 100644
--- a/release-notes/3.0/preview/3.0.0-preview-known-issues.md
+++ b/release-notes/3.0/preview/3.0.0-preview-known-issues.md
@@ -33,6 +33,25 @@ To update the path for every new terminal session, the `export` entry will need
 
 ## ASP.NET Core
 
+### Preview 9
+
+- **WebSocket connections to IIS In-Process servers will close after the client sends ~30MB**
+
+    WebSocket connections to IIS In-Process servers will close after the client sends ~30MB of data.
+
+    To workaround this issue you can host your app with the [OutOfProcess](https://docs.microsoft.com/aspnet/core/host-and-deploy/aspnet-core-module?view=aspnetcore-3.0#out-of-process-hosting-model) hosting model. Or you can change the `MaxRequestBodySize` limit in your app when handling WebSocket requests by adding the following to your middleware pipeline:
+  
+  ```csharp
+  app.Use(next => context =>
+  {
+      if (context.WebSockets.IsWebSocketRequest)
+      {
+          context.Features.Get<IHttpMaxRequestBodySizeFeature>()?.MaxRequestBodySize = null;
+      }
+      return next(context);
+  });
+  ```
+
 ### Preview 8
 
 - **Starting a client or bi-directional streaming gRPC call with an already canceled `CallOptions.CancellationToken` will hang**