本地站点间歇性无法连接到SQL Server，而SSMS可以

Question

我有最奇怪的问题：一切正常工作，而我正在编写一个新的网站我工作在一个晚上时突然站点无法再连接到SQL Server。我可以使用SQL Server Management Studio快乐地连接，但该站点会引发以下异常。

此机器上的防火墙已完全禁用。

一个问题的想法是，我有SQL Server在我创建的本地用户下运行。有时，当我重新启动SQL Server服务以查看是否可以解决问题时，服务会抱怨登录失败。然后，我重新输入使服务首先运行的相同凭据，然后在AGAIN之后启动，指出该帐户已被授予登录权作为服务权限。然而，我尝试过使用网络服务和本地系统，这两者都提示我的网站出现同样的异常情况。

然而，它不时会发挥作用。我在域名连接的笔记本上运行此操作，所以我想知道这是否与我在家时无法与域进行交谈有关。但我创建的服务帐户是本地帐户。

虽然我在IIS 8上运行此Windows 8企业（以防万一它是Win8的一些已知问题）。

加入Pooling=no连接字符串也没有效果。 [Ref]

这是我的连接字符串：Data Source=.;Initial Catalog=NotesBoard;Integrated Security=SSPI; 我也用“我的机器名”替代了“。”。结果相同。甚至尝试过FQDN。

System.Web.HttpException was unhandled by user code
HResult=-2147467259 Message=Unable to connect to SQL Server database. Source=System.Web ErrorCode=-2147467259 WebEventCode=0 StackTrace: at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.EnsureDBFile(String connectionString) at System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) at System.Web.Security.SqlRoleProvider.GetRolesForUser(String username) at WebMatrix.WebData.SimpleRoleProvider.GetRolesForUser(String username) at System.Web.Security.RolePrincipal.IsInRole(String role) at ASP._Page_Views_Shared__Layout_cshtml.Execute() in d:\dtaylor\Documents\Visual Studio 2012\Projects\NotesBoard\NotesBoard\Views\Shared_Layout.cshtml:line 28 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.WebPages.WebPageBase.<>c__DisplayClass7.b__6(TextWriter writer) at System.Web.WebPages.HelperResult.WriteTo(TextWriter writer) at System.Web.WebPages.WebPageBase.Write(HelperResult result) at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action 1 body) at System.Web.WebPages.WebPageBase.PopContext() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func 1 continuation)
InnerException: System.Web.HttpException HResult=-2147467259 Message=Unable to connect to SQL Server database. Source=System.Web ErrorCode=-2147467259 WebEventCode=0 StackTrace: at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) at System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) at System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) InnerException: System.Data.SqlClient.SqlException HResult=-2146232060 Message=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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) Source=.Net SqlClient Data Provider ErrorCode=-2146232060 Class=20 LineNumber=0 Number=-1 Server="" State=0 StackTrace: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action 1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource 1 retry) at System.Data.SqlClient.SqlConnection.Open() at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) InnerException:

更新： 此错误是在新的岗位here

Answer 1

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.

看起来像在Web服务器和SQL服务器之间的网络问题，更明确的界定。可能是任何东西：防火墙，DNS，...也可能是你的SQL服务器的间歇性问题。

与系统管理员联系以获取更多详细信息。你的代码没有问题。