asp.net-mvc - 将 Unity 与 Windows Azure 结合使用 : An attempt was made to access a socket in a way forbidden by its access permissions

Question

我目前正在开发一个 ASP.NET MVC 应用程序，该应用程序使用 Unity 作为 IoC 容器。该解决方案使用 SQL Azure 后端部署到 Windows Azure 并实现 Azure 缓存。

将应用程序部署到 Windows Azure 后，一切似乎都工作正常。但经过几次请求后，我收到错误“尝试以访问权限禁止的方式访问套接字”。

例如，如果我浏览到该网站并重复发起 AJAX POST(例如自动完成输入)请求，它将在前几个请求中正常工作，但随后崩溃(通过在 Chrome 中显示 HTTP 500 错误)开发工具控制台)。然后，如果我尝试刷新页面，我会收到套接字错误，直到应用程序重新启动或池被回收。

即使我在页面之间滑动，一段时间后我也会收到相同的错误，即它不仅仅与 AJAX 请求隔离。 AJAX 请求只是复制问题的最快方法。

我想知道错误尝试创建“MySite.Web.MVC.Controllers.LocationsController”类型的 Controller 时发生错误。确保 Controller 具有无参数公共(public)构造函数。] 堆栈跟踪中的内容是转移注意力的，因为 Controller 使用的 ILocationCacheService 映射正在由 Unity 解析。 AJAX 请求在前几次有效，因此它肯定会解析映射。

本地一切正常，或者至少我无法复制该错误。

堆栈跟踪

    Server Error in '/' Application.

    An attempt was made to access a socket in a way forbidden by its access permissions

    Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

    Exception Details: System.Net.Sockets.SocketException: An attempt was made to access a socket in a way forbidden by its access permissions

    Source Error: 

    An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

    Stack Trace: 


    [SocketException (0x271d): An attempt was made to access a socket in a way forbidden by its access permissions]
       System.Net.Sockets.Socket.DoMultipleAddressConnectCallback(Object result, MultipleAddressConnectAsyncResult context) +1847654
       System.Net.Sockets.Socket.DoDnsCallback(IAsyncResult result, MultipleAddressConnectAsyncResult context) +34
       System.Net.Sockets.Socket.BeginConnect(String host, Int32 port, AsyncCallback requestCallback, Object state) +271
       Microsoft.ApplicationServer.Caching.SocketConnectionFactory.BeginConnect(String host, Int32 port, AsyncCallback callback, Object state, TimeSpan timeout) +469
       Microsoft.ApplicationServer.Caching.TcpClientChannelFactory.BeginConnect(String host, Int32 port, AsyncCallback callback, Object state) +119
       Microsoft.ApplicationServer.Caching.TcpClientChannel.ConnectAsync() +368
       Microsoft.ApplicationServer.Caching.SocketClientChannel.TryGetTcpChannelUntilTimeout(TcpClientChannel clientChannel, ITcpChannel& chnl) +41
       Microsoft.ApplicationServer.Caching.SocketClientChannel.Send(EndpointID endpoint, IVelocityRequestPacket packet) +188
       Microsoft.ApplicationServer.Caching.SocketClientChannel.Send(EndpointID endpoint, ICreateMessage message) +112
       Microsoft.ApplicationServer.Caching.SimpleSendReceiveModule.Send(EndpointID endpoint, RequestBody request, Int32 retries) +73
       Microsoft.ApplicationServer.Caching.SimpleSendReceiveModule.SendMsgAndWait(EndpointID endpt, RequestBody reqMsg, TimeSpan requestTimeout, IRequestTracker& tracker) +428
       Microsoft.ApplicationServer.Caching.SocketClientProtocol.SendMessage(EndpointID endPt, RequestBody request) +52
       Microsoft.ApplicationServer.Caching.DataCacheFactory.EstablishConnection(IEnumerable`1 servers, RequestBody request, Func`3 sendMessageDelegate, DataCacheReadyRetryPolicy retryPolicy) +253
       Microsoft.ApplicationServer.Caching.<>c__DisplayClass5.<Initialize>b__2(RequestBody req) +83
       Microsoft.ApplicationServer.Caching.SocketClientProtocol.SendReceive(IVelocityRequestPacket request, Func`2 delegate, EndpointID& destination) +34
       Microsoft.ApplicationServer.Caching.SocketClientProtocol.Initialize(IEnumerable`1 servers) +367
       Microsoft.ApplicationServer.Caching.DataCacheFactory.GetCache(String cacheName, CreateNewCacheDelegate cacheCreationDelegate, DataCacheInitializationViaCopyDelegate initializeDelegate) +400
       Microsoft.ApplicationServer.Caching.DataCacheFactory.GetCache(String cacheName) +61
       Microsoft.ApplicationServer.Caching.DataCacheFactory.GetDefaultCache() +11
       MySite.Services.Cache.Implementations.LocationCacheService..ctor(ILocationService locationService) +64
       lambda_method(Closure , IBuilderContext ) +176
       Microsoft.Practices.ObjectBuilder2.<>c__DisplayClass1.<GetBuildMethod>b__0(IBuilderContext context) +35
       Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context) +10
       Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context) +196
       Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) +193
       Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey) +113
       Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext context) +48
       lambda_method(Closure , IBuilderContext ) +107
       Microsoft.Practices.ObjectBuilder2.<>c__DisplayClass1.<GetBuildMethod>b__0(IBuilderContext context) +35
       Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context) +10
       Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context) +196
       Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) +193
       Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides) +165

    [ResolutionFailedException: Resolution of the dependency failed, type = "MySite.Web.MVC.Controllers.LocationsController", name = "(none)".
    Exception occurred while: Calling constructor MySite.Services.Cache.Implementations.LocationCacheService(MySite.Services.Interfaces.ILocationService locationService).
    Exception is: SocketException - An attempt was made to access a socket in a way forbidden by its access permissions
    -----------------------------------------------
    At the time of the exception, the container was:

      Resolving MySite.Web.MVC.Controllers.LocationsController,(none)
      Resolving parameter "locationCacheService" of constructor MySite.Web.MVC.Controllers.LocationsController(MySite.Services.Cache.Interfaces.ILocationCacheService locationCacheService)
        Resolving MySite.Services.Cache.Implementations.LocationCacheService,(none) (mapped from MySite.Services.Cache.Interfaces.ILocationCacheService, (none))
        Calling constructor MySite.Services.Cache.Implementations.LocationCacheService(MySite.Services.Interfaces.ILocationService locationService)
    ]
       Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides) +329
       Microsoft.Practices.Unity.UnityContainer.Resolve(Type t, String name, ResolverOverride[] resolverOverrides) +15
       Microsoft.Practices.Unity.UnityContainerExtensions.Resolve(IUnityContainer container, Type t, ResolverOverride[] overrides) +18
       Unity.Mvc4.UnityDependencyResolver.GetService(Type serviceType) +67
       System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +41

    [InvalidOperationException: An error occurred when trying to create a controller of type 'MySite.Web.MVC.Controllers.LocationsController'. Make sure that the controller has a parameterless public constructor.]
       System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +178
       System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +77
       System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +66
       System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +191
       System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +50
       System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
       System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
       System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +301
       System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Answer 1

我设法使用 maxconnectionstoserver="1" 的缓存连接池解决了这个问题。这是 datacacheclient 的 web.config 设置部分:

<dataCacheClient name="default" isCompressionEnabled="true" maxConnectionsToServer="1" connectionPool="true" useLegacyProtocol="false">