Question

我在使用SQL Server设置基于C＃的网站的开发实例时遇到了一些麻烦。我习惯用MySQL做这一切，所以这对我来说有点陌生。通过MS故障排除阅读后，我的设置似乎没问题，但这仍然无法正常工作，所以很明显我在某处不知所措。

我已使用以下配置将web.config文件设置为指向新数据库;

<connectionStrings>
    <add name="External" 
         connectionString="Data Source=91.208.99.2,33114; Initial Catalog=sqldatabase;User ID=sqluser;Password=1234567890" 
         providerName="System.Data.SqlClient"/>
</connectionStrings>

但是，连接仍然失败，并出现以下错误。我有什么想法可以丢失吗？

[Win32Exception（0x80004005）：系统找不到指定的文件]

[SqlException（0x80131904）：建立与SQL Server的连接时发生与网络相关或特定于实例的错误。服务器未找到或无法访问。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 - 无法打开与SQL Server的连接）]

这是堆栈跟踪的其余部分;

System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +6569310
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +717
   System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) +6595752
   System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) +219
   System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) +6598063
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) +6598643
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData) +942
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +1162
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +72
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +6601897
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +103
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +2102
   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 oldConnection, DbConnectionInternal& connection) +1079
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +6606391
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +233
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +278
   System.Data.SqlClient.SqlConnection.Open() +239
   SubSonic.SqlDataProvider.CreateConnection(String newConnectionString) +48
   SubSonic.AutomaticConnectionScope..ctor(DataProvider provider) +58
   SubSonic.SqlDataProvider.GetDataSet(QueryCommand qry) +383
   SubSonic.StoredProcedure.GetDataSet() +64
   _usercontrols_layout_header.Page_Load(Object sender, EventArgs e) in \\sambad\sites\dev.aciemgroup.co.uk\public_html\_usercontrols\layout\header.ascx.cs:57
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178

Answer 1

错误本身已在web.config上说错误的服务器配置：

发生与网络相关或特定于实例的错误建立与SQL Server的连接。找不到服务器或无法访问。验证实例名称是否正确 SQL Server配置为允许远程连接。（提供者：命名管道提供程序，错误：40 - 无法打开与SQL Server的连接）

由于它说＆＃34;服务器未找到＆＃34;，SQL Server连接字符串可能成为主要问题。

如果您在远程服务器上有一个SQL Server实例/服务器名称（例如SERVERNAME），请在IP地址或机器名后附加它，就在服务器端口连接之前：

<connectionStrings>
<add name="External" connectionString="Data Source=91.208.99.2\SERVERNAME,33114; Initial Catalog=sqldatabase;User ID=sqluser;Password=1234567890" providerName="System.Data.SqlClient"/>
</connectionStrings>

对于SQL Server Express实例，连接字符串应如下所示：

<connectionStrings>
<add name="External" connectionString="Data Source=91.208.99.2\SQLEXPRESS,33114; Initial Catalog=sqldatabase;User ID=sqluser;Password=1234567890" providerName="System.Data.SqlClient"/>
</connectionStrings>

将Network Library=DBMSSOCN添加到web.config上的连接字符串时，关于HTTP 500错误，有关详细信息，请参阅下面的MS KB参考，具体取决于HResult代码。如果HResult代码返回0x8007000d，则需要正确修改连接字符串内的目标服务器，如上所述。

添加网络库后的连接字符串应为：

<connectionStrings>
<add name="External" connectionString="Data Source=91.208.99.2\SERVERNAME,33114;Network Library=DBMSSOCN;Initial Catalog=sqldatabase;User ID=sqluser;Password=1234567890" providerName="System.Data.SqlClient"/>
</connectionStrings>

PS：检查并修改远程服务器的其他安全/机器/用户权限（如果有），确保之后数据库连接正常工作。

参考文献：

MS KB 942055 - https://support.microsoft.com/en-us/kb/942055

The right connection string for Remote SQL server for C#

ConnectionString for remote SQL Server

Answer 2

谢谢大家的投入，结果托管公司（尽管声称一切都很好），都有错。非常抱歉浪费了任何时间，让他们承认过错也不仅有点令人沮丧！最后，我们设置了一个单独的MS SQL服务器，连接得很好。

无法将网站连接到SQL Server

2 个答案: