问题描述
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.验证实例名称正确，并且已将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)
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
推荐答案
基本上，当您无法连接到SQL Server时，问题可能是:
1)网络问题，
2)SQL Server配置问题.
3)防火墙问题，
4)客户端驱动程序问题，
5)应用程序配置问题.
6)身份验证和登录问题.
Basically, when you failed to connect to your SQL Server, the issue could be:
1) Network issue,
2) SQL Server configuration issue.
3) Firewall issue,
4) Client driver issue,
5) Application configuration issue.
6) Authentication and logon issue.
检查这些
解决SQL连接问题的步骤 [ ^ ]
SQL Server 2005连接性问题疑难解答-第一部分 [ ^ ]
对SQL Server 2005中的连接问题进行故障排除-第二部分 [ ^ ]
对SQL Server 2005中的连接问题进行故障排除-第III部分 [ ^ ]
顺便说一句，BTW还会检查这堆中是否有将来的错误.
Check these
Steps to troubleshoot SQL connectivity issues[^]
SQL Server 2005 Connectivity Issue Troubleshoot - Part I[^]
Troubleshoot Connectivity Issue in SQL Server 2005 - Part II[^]
Troubleshoot Connectivity Issue in SQL Server 2005 - Part III[^]
BTW check this bunch also for future errors.
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