无法连接到服务器-网络相关或特定于实例的错误

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

把我的高度好评的评论作为一个截图的回答。

我在这上面花了很多时间，最后对我有用的是:

1)打开Sql Server Configuration Manager—> Sql Server Network Configuration—> Protocols for <(INSTANCE)>—> TCP/IP(双击它)。

2)选择“——> IP Addresses(Tab)”。

3)转到最后一个条目IP All，并提到TCP端口1433。

4)按“Win+R”，输入services.msc。

5)现在重启SQL Server <(INSTANCE)>。

在这之后，问题解决了!

2016-07-28 15:46:45

其他回答

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.

2013-08-05 14:33:50

当sql server实例停止时发生此错误。

进入所有程序>SQL Server >配置工具>SQL Server配置管理器

然后点击SQL sERVER SERVICES，实例列表将出现，选择实例问题，并点击顶部工具栏上的播放图标，希望这将有所帮助。

这个答案很晚(但晚总比不到好;)

2016-04-16 12:58:23

如果Tomcat服务器或您正在使用的任何服务器宕机，则可能发生此错误。

2022-09-23 11:29:09

似乎您的localdb实例没有运行。要在计算机启动时启动它，添加到您的开始菜单\启动文件夹BAT文件与以下行