Asp.net 登录页面在VisualStudio中工作，而不是在IIS中

这似乎是一个重复的问题，但其他帖子中提供的答案没有帮助。

我正在制作一个C#ASP.NET网站，目前它在Visual Studio IDE中测试时运行良好。该网站使用创建新asp.net web应用程序时创建的默认登录控件。问题是，当通过IIS（从另一台计算机转到主机IP地址）加载时，每个页面都会加载，但登录部分失败。以下是错误屏幕：

描述：执行当前web请求期间发生未处理的异常。请查看堆栈跟踪以了解有关错误的更多信息以及错误在代码中的起源。 异常详细信息：System.Data.SqlClient.SqlException:建立到SQL Server的连接时发生网络相关或特定于实例的错误。找不到服务器或无法访问服务器。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：SQL网络接口，错误：50-发生本地数据库运行时错误。无法创建自动实例。有关错误详细信息，请参阅Windows应用程序事件日志。）。 )

堆栈跟踪：

[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: SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. Cannot create an automatic instance. See the Windows Application event log for error details.
)]
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling) +1394
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +1120
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +70
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +910
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +114
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +1637
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +117
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +267
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +318
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +211
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +393
   System.Data.SqlClient.SqlConnection.Open() +122
   System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +104
   System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext) +509
   System.Data.Entity.SqlServer.<>c__DisplayClass33.<UsingConnection>b__32() +567
   System.Data.Entity.SqlServer.<>c__DisplayClass1.<Execute>b__0() +15
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +238
   System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action`1 act) +916
   System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable`1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript) +117
   System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection) +212
   System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection) +135
   System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase) +175
   System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration) +116
   System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext) +121
   System.Data.Entity.Database.Create(DatabaseExistenceState existenceState) +293
   System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context) +187
   System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action) +72
   System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization() +483
   System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input) +177
   System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action) +274
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +38
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +77
   System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() +21
   System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +59
   System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync(IQueryable`1 source, Expression`1 predicate, CancellationToken cancellationToken) +208
   System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync(IQueryable`1 source, Expression`1 predicate) +172
   Microsoft.AspNet.Identity.EntityFramework.<GetUserAggregateAsync>d__6c.MoveNext() +502
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +13891908
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +61
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +48
   Microsoft.AspNet.Identity.<FindAsync>d__12.MoveNext() +357
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +13891908
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +61
   Microsoft.AspNet.Identity.AsyncHelper.RunSync(Func`1 func) +348
   Account_Login.LogIn(Object sender, EventArgs e) +119
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +11762637
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +150
   System.Web.UI.<ProcessRequestMainAsync>d__523.MoveNext() +7798

[SqlException（0x80131904）：建立到SQL Server的连接时发生与网络相关或特定于实例的错误。找不到或无法访问该服务器。请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：SQL网络接口，错误：50-发生本地数据库运行时错误。无法创建自动实例。有关错误详细信息，请参阅Windows应用程序事件日志。）。
)]
System.Data.SqlClient.SqlInternalConnectionDS..ctor（DbConnectionPoolIdentity、SqlConnectionString connectionOptions、SqlCredential凭证、对象提供信息、String newPassword、SecureString newSecurePassword、Boolean redirectedUserInstance、SqlConnectionString userConnectionOptions、SessionData重新连接SessionData、DbConnectionPool池、String accessToken、Boolean applyTransientF奥兰多（1394）
System.Data.SqlClient.SqlConnectionFactory.CreateConnection（DbConnectionOptions选项、DbConnectionPoolKey poolKey、Object poolGroupProviderInfo、DbConnectionPool池、DbConnectionOwningConnection、DbConnectionOptions用户选项）+1120
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（DbConnectionPool池、DbConnectionOwningObject、DbConnectionOptions选项、DbConnectionPoolKey池键、DbConnectionOptions用户选项）+70
System.Data.ProviderBase.DbConnectionPool.CreateObject（DbConnection-owningObject、DbConnectionOptions-userOptions、DbConnectionInternal-oldConnection）+910
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（DbConnection owningObject、DbConnectionOptions userOptions、DbConnectionInternal oldConnection）+114
System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection-owningObject，UInt32-waitForMultipleObjectsTimeout，布尔allowCreate，布尔OnlyOnEckConnection，DbConnectionOptions-userOptions，DbConnectionInternal&connection）+1637
System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject、TaskCompletionSource`1重试、DbConnectionOptions用户选项、DbConnectionInternal和connection）+117
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection（DbConnection所有者连接、TaskCompletionSource`1重试、DbConnectionOptions用户选项、DbConnectionInternal oldConnection、DbConnectionInternal和connection）+267
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（DbConnection outerConnection、DbConnectionFactory connectionFactory、TaskCompletionSource`1重试，DbConnectionOptions用户选项）+318
System.Data.SqlClient.SqlConnection.TryOpenInner（TaskCompletionSource`1重试）+211
System.Data.SqlClient.SqlConnection.TryOpen（TaskCompletionSource`1重试）+393
System.Data.SqlClient.SqlConnection.Open（）+122
System.Data.Entity.Infrastructure.InternalDispatcher`1.Dispatch（目标目标，操作`2操作，TInterceptionContext拦截上下文，操作`3执行，操作`3执行）+104
System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open（DbConnection-connection，DbInterceptionContext-interceptionContext）+509
System.Data.Entity.SqlServer.c__DisplayClass33.b__32（）+567
System.Data.Entity.SqlServer.c__DisplayClass1.b__0（）+15
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute（Func`1操作）+238
System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection（DbConnection-sqlConnection，Action`1-act）+916
System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript（可空`1 commandTimeout，DbConnection-sqlConnection，String-createDatabaseScript）+117
System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase（DbConnection连接，null`1 commandTimeout，StoreItemCollection StoreItemCollection）+212
System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create（DbConnection）+135
System.Data.Entity.Migrations.Dbmigator.EnsureDatabaseExists（操作必须成功访问数据库）+175
System.Data.Entity.Migrations.DbMigrator.Update（字符串targetMigration）+116
System.Data.Entity.Internal.DatabaseCreator.CreateDatabase（InternalContext InternalContext，Func`3 createMigrator，ObjectContext ObjectContext）+121
System.Data.Entity.Database.Create（DatabaseExistenceState）+293
System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase（TContext上下文）+187
System.Data.Entity.Internal.InternalContext.PerforminizationAction（Action Action）+72
System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization（）+483
System.Data.Entity.Internal.RetryAction`1.PerformAction（TInput输入）+177
System.Data.Entity.Internal.LazyInter
<connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=aspnet-nes-a6ab9e95-1ec8-4eee-af0f-bc33406759d6;AttachDbFilename=|DataDirectory|\aspnet-nes-a6ab9e95-1ec8-4eee-af0f-bc33406759d6.mdf;Integrated Security=SSPI" providerName="System.Data.SqlClient" />
  </connectionStrings>

  <connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(local)\SQLEXPRESS;Initial Catalog=InstituteManagementDB;Persist Security Info=False" providerName="System.Data.SqlClient" />
  </connectionStrings>