System.Data.SqlClient.SqlException

Question

嘗試訪問特定網頁時，我始終收到以下錯誤。

使用超出應用程序級別注冊為allowDefinition='MachineToApplication'的節是錯誤的。 此錯誤可能是由於未在IIS中將虛擬目錄配置為應用程序引起的。

當我進入IIS並將目錄配置為應用程序時，按照錯誤狀態應該執行的操作，該頁面似乎正在等待響應，並顯示空白頁面大約1-2分鍾，然后出現以下錯誤：

 Server Error in '/inventory' Application.

 A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
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.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

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:


[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +6256377
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +245
   System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +6270399
   System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +181
   System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +6271242
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +6271208
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +354
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +703
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +54
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +6272472
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +81
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +1657
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +88
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +6275911
   System.Data.SqlClient.SqlConnection.Open() +258
   Inventory1.welcome.Page_Load(Object sender, EventArgs e) +219
   System.Web.UI.Control.OnLoad(EventArgs e) +132
   System.Web.UI.Control.LoadRecursive() +66
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428

SQL Server已啟動，該站點上的所有其他頁面均可訪問。 我一直在每天大約幾個小時內每天嘗試解決此錯誤，但至今沒有成功。 我是IIS的新手，目前我無法想到要嘗試的其他方法。 我想知道是否有人可以幫助我確定此錯誤的原因。 大約2周前，該特定頁面正在加載並且工作正常。

Answer 1

您在該頁面上所做的一切似乎都無法訪問SQL Server。 您如何連接到數據庫？ 使用Windows身份驗證還是使用SQL Server登錄名？ 您在IIS中使用模擬嗎？ 我猜想，例如，您要運行一些SP，而該用戶沒有運行SP的權限。

您可以使用IIS中的數據庫連接管理器檢查數據庫連接的可訪問性（和可用性）嗎？ 此IIS幫助顯示了如何執行此操作。

Answer 2

您絕對應該將虛擬目錄保留為應用程序。

連接字符串可能出現SQL錯誤。

您說其他頁面可以工作...所有頁面是否都以標准方式連接到SQL？ 它們是否都從web.config獲取連接字符串？ 還是在頁面上進行了硬編碼？