IIS配置的网站无法登录？

悬赏园豆：10 [已解决问题] 解决于 2013-02-14 16:36

做了个小网站，在VS2010中按Ctrl+F5运行时一切正常，但是用IIS7配置以后，可以打开登录界面，但输入用户名和密码后提示登录失败。

出现的信息如下：

“/”应用程序中的服务器错误。

用户 'IIS APPPOOL\OASystem' 登录失败。

说明: 执行当前 Web 请求期间，出现未经处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.Data.SqlClient.SqlException: 用户 'IIS APPPOOL\OASystem' 登录失败。

源错误:

行 44:         {
行 45:            
行 46:             T_Message T_m = db.T_Message.First(m => m.Msg_Status == false && m.Msg_Receive == username);
行 47:             return true;
行 48:         }

源文件: e:\Programme\Web\OASystem\App_Code\MessagerManager.cs 行: 46

堆栈跟踪:

[SqlException (0x80131904): 用户 'IIS APPPOOL\OASystem' 登录失败。]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +6676046
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +810
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4403
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +84
   System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) +55
   System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) +368
   System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) +6704814
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) +6705315
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions) +610
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +1049
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +74
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions userOptions) +6707883
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions userOptions) +78
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +2192
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +116
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +1012
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +6712511
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +152
   System.Data.SqlClient.SqlConnection.Open() +229
   System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection(IConnectionUser user) +65
   System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe() +38
   System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode() +30
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +81
   System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression expression) +50
   System.Linq.Queryable.First(IQueryable`1 source, Expression`1 predicate) +490
   MessagerManager.GetMessage(String username) in e:\Programme\Web\OASystem\App_Code\MessagerManager.cs:46
   MasterPage.Page_Load(Object sender, EventArgs e) in e:\Programme\Web\OASystem\MasterPage.master.cs:19
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178

版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.0.30319.18034

请问该怎么配置？还是我网页的代码写得有问题？

登录是使用Login控件的，没有写额外的代码

ASP.NET 网站开发

问题补充：

public static bool GetMessage(string username)
{
        DataBaseDataContext db = new DataBaseDataContext();
        try
        {
            T_Message T_m = db.T_Message.First(m => m.Msg_Status == false && m.Msg_Receive == username);
            return true;
        }
        catch (System.InvalidOperationException)
        {
            return false;
        }
 }