关于c＃：mvc应用程序无法连接到数据库

mvc application can't connect to database

当我从本地计算机运行我的项目时，我可以连接到数据库。当我发布它时，会收到一个错误(如下)。我相信这个问题与应用程序池有关，但我不知道它是什么。

这是一个全新的安装，包括操作系统

标识-应用程序池

连接字符串

1	</connectionStrings>

误差

过程信息：流程ID:5872进程名：w3wp.exe帐户名：IIS AppPoolDefaultAppPool

异常信息：异常类型：sqlException异常消息：与SQL Server建立连接时出现与网络相关或特定于实例的错误。找不到或无法访问服务器。验证实例名称是否正确，以及SQL Server是否配置为允许远程连接。(提供程序：命名管道提供程序，错误：40-无法打开到SQL Server的连接)at system.data.sqlclient.sqlInternalConnection.onerror(sqlException异常、Boolean BreakConnection、Action1 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, SessionData reconnectSessionData)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource1重试、dbConnectionOptions用户选项、dbConnectionInternal&Connection)在system.data.providerBase.dbConnectionFactory.TryGetConnection(dbConnection OwningConnection，taskCompletionSourc1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1重试，dbConnectionOptions用户选项)at system.data.sqlclient.sqlconnection.tryopenner(taskcompletionsourc1 retry)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1重试)在system.data.sqlclient.sqlconnection.open()处位于System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(布尔openCondition、DbConnectionStoreConnectionToOpen、DbConnection OriginalConnection、字符串异常代码、字符串attemptedOperation、布尔值&；CloseStoreConnectionOnFailure)

找不到网络路径

1	Server Error in '/spadashboard' Application.

超时已过期。从池获取连接之前经过的超时时间。这可能是因为所有池连接都在使用中，并且达到了最大池大小。

描述：执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的来源的更多信息。

异常详细信息：System.InvalidOperationException:超时已过期。从池获取连接之前经过的超时时间。这可能是因为所有池连接都在使用中，并且达到了最大池大小。

源错误：

在执行当前Web请求期间生成了未处理的异常。有关异常的起源和位置的信息可以使用下面的异常堆栈跟踪来标识。

堆栈跟踪：

[无效操作异常：超时已过期。从池获取连接之前经过的超时时间。这可能是因为所有池连接都在使用中，并且达到了最大池大小。]system.data.providerBase.dbConnectionFactory.TryGetConnection(dbConnection OwningConnection，taskCompletionSourc1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +6600161
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1重试，dbConnectionOptions用户选项)+6600667system.data.sqlclient.sqlconnection.tryopenner(taskcompletionsourc1 retry) +233
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1重试)+278system.data.sqlclient.sqlconnection.open()+239System.Data.EntityClient.EntityConnection.OpenStoreConnectionif(Boolean OpenCondition、DbConnectionStoreConnectionToOpen、DbConnection OriginalConnection、字符串异常代码、字符串尝试操作、Boolean&；CloseStoreConnectionOnFailure)+99

[实体异常：基础提供程序在打开时失败。]System.Data.EntityClient.EntityConnection.OpenStoreConnectionif(Boolean OpenCondition、DbConnectionStoreConnectionToOpen、DbConnection OriginalConnection、字符串异常代码、字符串尝试操作、Boolean&；CloseStoreConnectionOnFailure)+10948975system.data.entityClient.entityConnection.open()+136System.Data.Objects.ObjectContext.EnsureConnection()+91system.data.objects.objectcontext.executestoreQueryInternal(string commandText，string entitysetname，mergeoption mergeoption，object[]参数)+109system.data.objects.objectcontext.executeStoreQuery(string commandText，object[]参数)+87System.Data.Entity.Internal.InternalContext.ExecuteSqlQuery(字符串SQL，对象[]参数)+118System.Data.Entity.Internal.InternalContext.ExecuteSqlQueryAsienumerable(字符串SQL，对象[]参数)+85system.data.entity.internal.internalContext.executesqlquery(type elementtype，string sql，object[]参数)+260system.data.entity.internal.internalsqlnonsetquery.getEnumerator()+34system.data.entity.internal.internalsqlquery1.GetEnumerator() +28
System.Linq.Enumerable.FirstOrDefault(IEnumerable1源+220spadash.controllers.accountsController.checklogin(usrlogin cred)+151lambda_方法(闭包，ControllerBase，对象[])+127system.web.mvc.reflectedActionDescriptor.execute(ControllerContext ControllerContext，IDictionary2 parameters) +242
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2参数)+39system.web.mvc.async.asyncControllerActionInvoke