diff --git a/sandbox/OpenIddict.Sandbox.AspNet.Server/Startup.cs b/sandbox/OpenIddict.Sandbox.AspNet.Server/Startup.cs
index ea9c62fc..6d44400d 100644
--- a/sandbox/OpenIddict.Sandbox.AspNet.Server/Startup.cs
+++ b/sandbox/OpenIddict.Sandbox.AspNet.Server/Startup.cs
@@ -160,6 +160,7 @@ namespace OpenIddict.Sandbox.AspNet.Server
             };
 
             configuration.MapHttpAttributeRoutes();
+            configuration.SuppressDefaultHostAuthentication();
 
             // Register the Autofac Web API integration and Web API middleware.
             app.UseAutofacWebApi(configuration);