打开UDP端口1434以浏览命名实例_MySQL
问：本地的一个ISP托管了我们的SQL Server，但是我不能看到或连接到运行在该计算机上的命名实例。我知道SQL Server 2000命名实例不使用TCP/IP 1433端口，并且确定该SQL Server实例所使用的TCP/IP端口是打开的。您有什么建议吗？
答：许多人知道如何使用SQL Server网络实用工具或SQL Server错误日志来确定SQL Server实例的监听端口。但许多人似乎忘记或者根本不知道——UDP 1434端口也必须是打开的，以确保您能够正确地访问和浏览命名实例。我建议您仔细研究一下这一要求。在SQL Server在线书籍中搜索“1434”，您将得到三个颇有研究价值的搜索结果。在SQL Server杂志网站2001年7月刊我的SQL Server实用技巧专栏中，您还可以查找到有关访问命名实例的信息（InstantDoc ID 21127）。在此我也简单解释一下。SQL Server在UDP 1434端口上建立一个监听服务，让客户端从服务器上查询到命名实例及其网络配置信息的一个列表。该监听服务始终运行在UDP 1434端口上，并且用户无法更改该运行端口。
—Brian Moran
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