diff --git a/quickstarts/dapr/dapr-azure.bicep b/quickstarts/dapr/dapr-azure.bicep
index a993ee5a..d73f3802 100644
--- a/quickstarts/dapr/dapr-azure.bicep
+++ b/quickstarts/dapr/dapr-azure.bicep
@@ -48,7 +48,7 @@ resource frontend 'Applications.Core/containers@2022-03-15-privatepreview' = {
       }
       ports: {
         ui: {
-          containerPort: 80
+          containerPort: 8080
           provides: frontendRoute.id
         }
       }
diff --git a/quickstarts/dapr/dapr.bicep b/quickstarts/dapr/dapr.bicep
index 019861b7..28657635 100644
--- a/quickstarts/dapr/dapr.bicep
+++ b/quickstarts/dapr/dapr.bicep
@@ -51,7 +51,7 @@ resource frontend 'Applications.Core/containers@2022-03-15-privatepreview' = {
       }
       ports: {
         ui: {
-          containerPort: 80
+          containerPort: 8080
           provides: frontendRoute.id
         }
       }
diff --git a/quickstarts/dapr/ui/Dockerfile b/quickstarts/dapr/ui/Dockerfile
index a9f01155..c628b42e 100644
--- a/quickstarts/dapr/ui/Dockerfile
+++ b/quickstarts/dapr/ui/Dockerfile
@@ -10,4 +10,6 @@ RUN dotnet publish -c release -o /output/ --no-restore -r linux-musl-x64
 FROM mcr.microsoft.com/dotnet/aspnet:5.0-alpine
 WORKDIR /app
 COPY --from=build /output ./
+
 ENTRYPOINT ["dotnet", "ui.dll"]
+EXPOSE 8080
\ No newline at end of file
diff --git a/quickstarts/dapr/ui/Startup.cs b/quickstarts/dapr/ui/Startup.cs
index 82a34e26..93a19307 100644
--- a/quickstarts/dapr/ui/Startup.cs
+++ b/quickstarts/dapr/ui/Startup.cs
@@ -24,6 +24,10 @@ public void ConfigureServices(IServiceCollection services)
             services.AddServerSideBlazor();
 
             var appId = Environment.GetEnvironmentVariable("CONNECTION_BACKEND_APPID");
+            if (string.IsNullOrEmpty(appId))
+            {
+                throw new ArgumentNullException("CONNECTION_BACKEND_APPID", "Please set the environment variable CONNECTION_BACKEND_APPID to the id of the backend app.");
+            }
             services.AddSingleton<HttpClient>(DaprClient.CreateInvokeHttpClient(appId));
         }
 
diff --git a/quickstarts/dapr/ui/appsettings.json b/quickstarts/dapr/ui/appsettings.json
index d9d9a9bf..5964f66a 100644
--- a/quickstarts/dapr/ui/appsettings.json
+++ b/quickstarts/dapr/ui/appsettings.json
@@ -6,5 +6,12 @@
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "Kestrel": {
+    "Endpoints": {
+      "Http": {
+        "Url": "http://+:8080"
+      }
+    }
+  }
 }