当我尝试连接SQL Server时，我得到以下错误:
在建立与SQL Server的连接时，发生了与网络相关或特定于实例的错误。未找到服务器或无法访问服务器。验证实例名称是否正确，SQL Server是否配置为允许远程连接。(提供商:Named Pipes提供商，错误:40 -无法打开到SQL Server的连接)
当我试图在Visual Studio 2010中将数据库配置为gridview时抛出此错误。我不知道如何调试这个错误。
如何调试此错误?除了错误消息中提到的步骤之外，我还应该采取哪些步骤来确定这里到底发生了什么?
当前回答
这个解决方案解决了SQL服务器背后的网络错误和服务问题
我在这里回答了一个类似的问题，您需要统计其他开放运行类型->服务。msc -在服务->排序停止你会看到一堆停止的SQL服务右键单击并启动
开始-有4个问题可能会导致常见的LocalDb SqlExpress Sql Server连接错误Sql网络接口，错误:50 -本地数据库运行时错误发生，在开始之前，您需要将v11或v12重命名为(LocalDb)\mssqllocaldb
Troubleshooting Steps
您没有正在运行的服务，执行命令net start MSSQLSERVER或net start MSSQL$ instancename 这里没有防火墙端口 配置 你的安装有问题/损坏(下面的步骤可以帮助你一个干净的开始) 您没有将V11或12重命名为mssqllocaldb/SqlServer
我发现最简单的是做下面的事情——我附上了图片和步骤以寻求帮助。
Resolution Steps:
首先验证您已经安装了哪个实例，您可以通过检查注册表并运行cmd来完成此操作
i .执行命令> Sqllocaldb.exe cmd> Sqllocaldb.exe s "那个versionyouwantfromlistbefore " 如果此步骤失败，可以使用选项d删除cmd> Sqllocaldb.exe d "someDb" cmd> Sqllocaldb.exe c "createSomeNewDbIfyouWantDb" cmd> Sqllocaldb.exe start "createSomeNewDbIfyouWantDb"
重新启动MSSql服务器或简单地重新启动您的机器!
按住/按打开CMD，窗口+ R，输入“services.msc” 现在寻找sql server服务，打开查找带有实例名的sql server 然后重新启动此服务并重试
其他回答
我有自己的解决方案:
打开“SQL Server配置管理器” 现在点击“SQL Server网络配置”，然后点击“协议名称” 右键单击“TCP/IP”(确保它是启用的)单击属性 现在选择“IP地址”选项卡-转到最后一个条目“IP所有” 输入“TCP端口”1433。 现在重新启动“SQL Server . name .”使用“服务”。(winKey + r)
它会起作用……
我必须运行SQL Server浏览器服务到SQL Server配置管理器。 如果没有这个，安装就不能发现新创建的服务。
Web中的Xml标签排列。配置很重要
第一个
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
后
<connectionStrings>
<add name="SqlConnectionString" connectionString="Data Source=.; Initial Catalog=TestDB; Trusted_Connection=True;" providerName="System.Data.SqlClient" />
</connectionStrings>
我使用的是SQL Server 2016和windows 10。
首先是允许远程连接到SQL Server。 我所做的就是键入sqlservermanager13。在开始菜单打开SQL Server配置管理器。确保TCP/IP状态为启用状态。
双击TCP/IP协议名称，检查TCP端口号。通常默认值是1433。
以下步骤通过使用Microsoft管理控制台(MMC)管理单元配置Windows防火墙的高级安全。高级安全Windows防火墙只配置当前配置文件。
To open a port in the Windows firewall for TCP access On the Start menu, click Run, type WF.msc, and then click OK. In the Windows Firewall with Advanced Security, in the left pane, right-click Inbound Rules, and then click New Rule in the action pane. In the Rule Type dialog box, select Port, and then click Next. In the Protocol and Ports dialog box, select TCP. Select Specific local ports, and then type the port number of the instance of the Database Engine, such as 1433 for the default instance. Click Next. In the Action dialog box, select Allow the connection, and then click Next. In the Profile dialog box, select any profiles that describe the computer connection environment when you want to connect to the Database Engine, and then click Next. In the Name dialog box, type a name and description for this rule, and then click Finish.
另一个需要配置的东西。
To open access to SQL Server when using dynamic ports On the Start menu, click Run, type WF.msc, and then click OK. In the Windows Firewall with Advanced Security, in the left pane, right-click Inbound Rules, and then click New Rule in the action pane. In the Rule Type dialog box, select Program, and then click Next. In the Program dialog box, select This program path. Click Browse, and navigate to the instance of SQL Server that you want to access through the firewall, and then click Open. By default, SQL Server is at C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\Binn\Sqlservr.exe. Click Next. In the Action dialog box, select Allow the connection, and then click Next. In the Profile dialog box, select any profiles that describe the computer connection environment when you want to connect to the Database Engine, and then click Next. In the Name dialog box, type a name and description for this rule, and then click Finish.
看看微软的文档 配置Windows防火墙访问数据库引擎
我发现以下技巧很有用:
Make sure your database engine is configured to accept remote connections: Start > All Programs > SQL Server 2005 > Configuration Tools > SQL Server Surface Area Configuration Click on Surface Area Configuration for Services and Connections Select the instance that is having a problem > Database Engine > Remote Connections Enable local and remote connections Restart instance You may need to create an exception on the firewall for the SQL Server instance and port you are using: Start > Run > Firewall.cpl Click on exceptions tab Add sqlservr.exe (typically located in C:\Program Files (x86)\Microsoft SQL Server\MSSQL.x\MSSQL\Bin, check your installs for the actual folder path) and port (default is 1433) Check your connection string as well From FIX : ERROR : Could not open a connection to SQL Server: Check if your SQL server services is up and running properly: Go to All Programs > Microsoft SQL Server 2008 > Configuration Tools > SQL Server Configuration Manager > SQL Server Services Check to make sure SQL Server service status is Running. In addition, ensure that your remote server is in the same network. Run sqlcmd -L to ascertain if your server is included in your network list. Enable TCP/IP in SQL Server Configuration When two or more SQL Servers are connected across network they do all communication using TCP/IP. The default port of SQL Server installation is 1433. This port can be changed through SQL Server Configuration Manager. TCP/IP should be enabled for SQL Server to be connected. Go to All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Server Configuration Manager >> Select TCP/IP Right Click on TCP/IP >> Click on Enable You must restart SQL Server Services for all the changes to take effect. Right click and go to menu properties to select location where default port of SQL Server can be changed.
