diff --git a/src/fiskaltrust.Launcher.Common/Extensions/LoggerConfigurationExtensions.cs b/src/fiskaltrust.Launcher.Common/Extensions/LoggerConfigurationExtensions.cs
index 03c739d9..5f13253c 100644
--- a/src/fiskaltrust.Launcher.Common/Extensions/LoggerConfigurationExtensions.cs
+++ b/src/fiskaltrust.Launcher.Common/Extensions/LoggerConfigurationExtensions.cs
@@ -25,7 +25,7 @@ public static LoggerConfiguration AddLoggingConfiguration(this LoggerConfigurati
                 .MinimumLevel.Override("Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware", aspLogging ? LogEventLevel.Information : LogEventLevel.Warning)
                 .MinimumLevel.Override("System", LogEventLevel.Warning)
                 .MinimumLevel.Override("Grpc", LogEventLevel.Warning)
-                .MinimumLevel.Override("ProtoBuf", LogEventLevel.Warning);
+                .MinimumLevel.Override("ProtoBuf", LogEventLevel.Error);
 
             return loggerConfiguration;
         }
diff --git a/src/fiskaltrust.Launcher/Services/HostingService.cs b/src/fiskaltrust.Launcher/Services/HostingService.cs
index 7380cc4d..af28d402 100644
--- a/src/fiskaltrust.Launcher/Services/HostingService.cs
+++ b/src/fiskaltrust.Launcher/Services/HostingService.cs
@@ -19,6 +19,7 @@
 using System.Runtime.Versioning;
 using Microsoft.AspNetCore.Server.HttpSys;
 using System.Text.Json;
+using fiskaltrust.ifPOS.v0;
 
 namespace fiskaltrust.Launcher.Services
 {
@@ -249,6 +250,12 @@ private WebApplication CreateGrpcHost<T>(WebApplicationBuilder builder, Uri uri,
                 _logger.LogWarning($"{nameof(_launcherConfiguration.UseHttpSysBinding)} is not supported for grpc.");
             }
 
+            ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(IAsyncResult), true);
+            ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(AsyncCallback), true);
+            ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(Stream), true);
+            ProtoBuf.Meta.RuntimeTypeModel.Default.GetSchema(typeof(IPOS));
+            ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(IPOS), true).AddSubType(1, typeof(ifPOS.v1.IPOS));
+
             builder.WebHost.BindKestrel(uri, listenOptions => ConfigureTls(listenOptions), false, HttpProtocols.Http2);
             builder.Services.AddCodeFirstGrpc(options => options.EnableDetailedErrors = true);
             builder.Services.AddSingleton(instance);