An "Access Forbidden" error is displayed on Snow License Manager (SLM) login page on SLM 9.16

The Error logs on Web >>logs in license manager shows below:

Application error. [PAGE: (unknown) | EXCEPTION: An error occurred while attempting to automatically activate registration 'Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope'. See the inner exception for information on the source of the failure. ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = IBus (DelegateActivator), Services = [Rebus.Bus.IBus], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> Could not resolve Rebus.Transport.ITransport with decorator depth 0 - registrations: Rebus.Injection.Injectionist+Handler (See inner exception for details.) (See inner exception for details.) (See inner exception for details.) (Void StartStartableComponents(Autofac.IComponentContext), Autofac) | INNER EXCEPTION: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = IBus (DelegateActivator), Services = [Rebus.Bus.IBus], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> Could not resolve Rebus.Transport.ITransport with decorator depth 0 - registrations: Rebus.Injection.Injectionist+Handler (See inner exception for details.) (See inner exception for details.) (System.Object Activate(System.Collections.Generic.IEnumerable`1[Autofac.Core.Parameter]), Autofac)]

09:35:22,382 ERROR   APPLICATION     Application error. [PAGE: (unknown) | EXCEPTION: Object reference not set to an instance of an object. (Void Application_End(System.Object, System.EventArgs), SnowLicenseManagerWeb)]

11:17:34,794 AuthorizationApiControllerAPI         The operation was cancelled.

The Event Viewer log shows:

Exception information: 

  Exception type: TargetInvocationException 

  Exception message: Exception has been thrown by the target of an invocation.

  at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)

  at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)

  at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

  at Owin.Loader.DefaultLoader.<>c__DisplayClass12.<MakeDelegate>b__b(IAppBuilder builder)

  at Owin.Loader.DefaultLoader.<>c__DisplayClass1.<LoadImplementation>b__0(IAppBuilder builder)

  at Microsoft.Owin.Host.SystemWeb.OwinHttpModule.<>c__DisplayClass2.<InitializeBlueprint>b__0(IAppBuilder builder)

  at Microsoft.Owin.Host.SystemWeb.OwinAppContext.Initialize(Action`1 startup)

  at Microsoft.Owin.Host.SystemWeb.OwinBuilder.Build(Action`1 startup)

  at Microsoft.Owin.Host.SystemWeb.OwinHttpModule.InitializeBlueprint()

  at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)

  at Microsoft.Owin.Host.SystemWeb.OwinHttpModule.Init(HttpApplication context)

  at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)

  at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)

  at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)

  at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)

Unable to add module. The HubPipeline has already been invoked.

  at Microsoft.AspNet.SignalR.Hubs.HubPipeline.AddModule(IHubPipelineModule pipelineModule)

  at Microsoft.AspNet.SignalR.HubPipelineExtensions.RequireAuthentication(IHubPipeline pipeline)

  at SnowSoftware.LicenseManager.Web.SignalR.Configuration.SignalRStartup.Configuration(IAppBuilder app)

Snow License Manager (SLM) 9.16

In this instance the cause was that IP Address and Domain restrictions were enabled and the maximum number of requests was set to very low number (in this example this was set to 4).

To resolve the error we were able to disable this setting. 
After making the change the pages were now loading correctly on the SLM server:

However it was still not loading on local SLM users machine, for that the recommendation is to remove the IP and Domain restrictions Role from the Server