无法连接到Team Foundation Server 2008，出现以下错误

我正在使用Team Foundation Server 2008.最近，我将自定义帐户中的应用程序池标识更改为内置帐户。 现在它给了我以下错误：

TF53010: The following error has occurred in a Team Foundation component or extension: Date (UTC): 4/27/2012 5:52:04 AM Machine: 'Machine name' Application Domain: /LM/W3SVC/469237383/ROOT/Services-2-129799795235444094 Assembly: Microsoft.TeamFoundation.Server, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; v2.0.50727 Process Details: Process Name: w3wp Process Id: 2044 Thread Id: 4912 Account name: NT AUTHORITY\NETWORK SERVICE Detailed Message: TF30059: Fatal error while initializing web service Web Request Details Url: http://172.27.88.65:8080/Services/v1.0/ServerStatus.asmx [method: POST] User Agent: Team Foundation (devenv.exe, 10.0.40219.1) Headers: Content-Length=354&Content-Type=text%2fxml%3b+charset%3dutf-8&Accept-Encoding=gzip%2cgzip%2cgzip&Accept-Language=en-US&Authorization=NTLM+TlRMTVNTUAADAAAAGAAYAIQAAABAAUABnAAAAAwADABYAAAAEAAQAGQAAAAQABAAdAAAAAAAAADcAQAABYKIogYBsB0AAAAPzNwMcCQoNj5DllXRL0wQ9UMAWQBCAEEARwBFAHIAbwBoAGkAdABzAGgAZQBSAE8ASABJAFQAUwBIAEUAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAScCbf7HgE8WxhKm6b8N1LgEBAAAAAAAAQrHr3jkkzQEnHfSqYiSa%2fgAAAAACAAwAQwBZAEIAQQBHAEUAAQAUAEcAQQBOAEUAUwBIAC0AMgBLADgABAAUAGMAeQBiAGEAZwBlAC4AYwBvAG0AAwAqAEcAYQBuAGUAcwBoAC0AMgBrADgALgBjAHkAYgBhAGcAZQAuAGMAbwBtAAUAFABjAHkAYgBhAGcAZQAuAGMAbwBtAAcACABCseveOSTNAQYABAACAAAACAAwADAAAAAAAAAAAAAAAAAwAACCWwxwe013jUfTNQ2MjXw%2fCVKipQ1WGA3q2%2fqyv%2fU74QoAEAAAAAAAAAAAAAAAAAAAAAAACQAiAEgAVABUAFAALwAxADcAMgAuADIANwAuADgAOAAuADYANQAAAAAAAAAAAAAAAAA%3d&Expect=100-continue&Host=172.27.88.65%3a8080&User-Agent=Team+Foundation+(devenv.exe%2c+10.0.40219.1)&X-TFS-Version=1.0.0.0&X-TFS-Session=1b868cb2-92a4-40ac-ae65-f176904d53e5&SOAPAction=%22http%3a%2f%2fschemas.microsoft.com%2fTeamFoundation%2f2005%2f06%2fServices%2fServerStatus%2f03%2fCheckAuthentication%22 Path: /Services/v1.0/ServerStatus.asmx Local Request: False Host Address: 172.27.88.75 User: CYBAGE\rohitshe [authentication type: NTLM] Exception Message: TF30041: Team Foundation Server could not connect to the database. Contact your Team Foundation Server administrator. (type DatabaseConnectionException) Exception Stack Trace: at Microsoft.TeamFoundation.Server.Global.Initialize() at Microsoft.TeamFoundation.Server.TeamFoundationApplication.Init() Inner Exception Details: Exception Message: Cannot open database "TfsIntegration" requested by the login. The login failed. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. (type SqlException) SQL Exception Class: 11 SQL Exception Number: 4060 SQL Exception Procedure: SQL Exception Line Number: 65536 SQL Exception Server: GANESH-2K8 SQL Exception State: 1 SQL Error(s): SQL Error[1]: System.Data.SqlClient.SqlError: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Class: 14 Number: 18456 Server: 'Machine Name' Source: .Net SqlClient Data Provider State: 1 Procedure: Line Number: 65536 Exception Data Dictionary: HelpLink.ProdName = Microsoft SQL Server HelpLink.EvtSrc = MSSQLServer HelpLink.EvtID = 4060 HelpLink.BaseHelpUrl = http://go.microsoft.com/fwlink HelpLink.LinkId = 20476 Exception Stack Trace: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.TeamFoundation.RegistrationDataAccessor.GetRegisteredTools(String toolId, String connectionString) at Microsoft.TeamFoundation.RegistrationDataAccessor.GetRegistrationEntries(String toolId, String connectionString) at Microsoft.TeamFoundation.Server.RegistrationEventSchemaProvider..ctor(String applicationPath) at Microsoft.TeamFoundation.Server.CombinationEventSchemaProvider..ctor(String applicationPath) at Microsoft.TeamFoundation.Server.Global.Initialize() 

可能是什么问题，我怎么能解决它？