建立....時出現網絡相關或特定於實例的錯誤錯誤：26

Question

我正在使用我的asp.net項目;當我運行我的程序，它停止運行，並給了我這個消息：

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) Server Error in '/Test2' Application.

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) 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: 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 Error: 


Line 27:   string cmdString = "Delete from tblSessionCart"; 
Line 28:   SqlCommand cmd = new SqlCommand(cmdString, conn); 
Line 29:   conn.Open(); 
Line 30:   try 
Line 31:   { 


Source File: c:\Users\mousa\Desktop\Test2\App_Code\clsSessionCart.cs Line: 29 

Stack Trace: 

[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: 26 - Error Locating Server/Instance Specified)] 
    System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4876455 
    System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194 
    System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +354 
    System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +90 
    System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +401 
    System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +225 
    System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +189 
    System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +4889331 
    System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +31 
    System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +431 
    System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66 
    System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +499 
    System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65 
    System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117 
    System.Data.SqlClient.SqlConnection.Open() +122 
    clsSessionCart.DeleteCart() in c:\Users\mousa\Desktop\Test2\App_Code\clsSessionCart.cs:29 
    ASP.global_asax.Session_Start(Object sender, EventArgs e) in c:\Users\mousa\Desktop\Test2\Global.asax:27 
    System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +8878884 
    System.Web.SessionState.SessionStateModule.CompleteAcquireState() +237 
    System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +504 
    System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +66 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 


Version Information: Microsoft .NET Framework Version:2.0.50727.5477; ASP.NET Version:2.0.50727.5479 

Answer 1

此問題與連接字符串，

1. 檢查對象實例的服務器
2. 檢查用戶名和密碼

連接字符串：

Server=YOUR_SQLSERVER_INSTANCE;Database=YOUR_DATABASE_NAME;User Id=sa;Password=YOUR_SA_PASSWORD; 

如果您有實例，請確保實例在服務器指定，例如：

服務器= \ SQL2008

Answer 2

當你的SQLSERVER服務停止此異常拋出。或者當你的TCP端口改變時，請檢查那個。

Answer 3

我們將端口信息添加到了我們的連接字符串中，從而緩解了此錯誤。例如：

服務器= 服務器名，端口＃;數據庫= 數據庫名稱; ....

Answer 4

我得到的錯誤，因爲我DataSource被評爲

(localdb)\v11.0

和C＃反斜槓被解釋爲一個特殊字符，所以需要按照以下方式進行轉義：下面的行將起作用！但是單個「\」失敗。

String source = "Data Source=(localdb)" + "\\" + "v11.0;Initial Catalog=Northwind;Integrated Security=SSPI"; 
SqlConnection conn = new SqlConnection(source); 
conn.Open();