Question

我创建了一个访问数据库的Web服务。数据库和Web服务（即SQL服务器和IIS）都在同一台机器上。

问题在于，当我访问webservice时，使用我的客户端访问服务器上的数据库，一切正常。

但是当我从其他电脑访问它时，我收到数据库错误。

访问服务器时，相同的连接字符串工作正常，远程访问Web服务时不会打开连接。

任何帮助表示感谢。

[编辑]

当我在服务器上访问它时，我按照我的要求获取日志：

ConnectionString = Server = localhost \ instancename; Database = dbname; Uid = uid; Pwd = pwd;

当我远程访问时，我得到这样的日志：

ConnectionString = Server = localhost \ instancename; Database = dbname; Uid = uid; Pwd = pwd;

错误：

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Data.SqlClient.SqlException: 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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at CMACLBilling.AuthenticationService.Service1.GetUser(String userName)
   at CMACLBilling.BusinessControllers.UserBusinessController.Authenticate(String userName, String password, Int32& errorCode)
   at CMACLBilling.LoginWindow.btnLogin_Click(Object sender, RoutedEventArgs e)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

Answer 1

正如我猜测你的联系，你提供了错误的信息：

检查连接字符串：

ConnectionString = "Server=localhost\instancename;Database=dbname;Uid=uid;Pwd=pwd;"

，错误为Error Locating Server/Instance Specified - 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。找不到服务器或无法访问服务器。

localhost 是指您正在使用的系统。如果您从另一台计算机访问它，那么它将导致错误。

以下示例有助于配置正确的连接字符串：

<connectionStrings>

<add name=”SampleConnectionString” connectionString=”Data Source=machinename\instancename;Initial Catalog=AdventureWorks;Integrated Security=SSPI;Min Pool Size=5;Max Pool Size=60;Connect Timeout=30″ providerName=”System.Data.SqlClient”/>

</connectionStrings>

和Connect via an IP address of your server

Server = 190.190.200.100,1433;网络库= DBMSSOCN;初始 Catalog = myDataBase;用户ID = myUsername;密码= myPassword;

或

Server=IISPCName或Server= IISPCName\InstanceName

当我执行此类功能时，您可以从我的计算机属性中复制计算机名称，然后复制实例名称。

检查以下链接以解决此类问题：
Resolving “A network-related or instance-specific error occurred while establishing a connection to SQL Server…”

注意：如果以上连接不起作用，则必须检查sql server远程访问设置。检查以下链接是否有效：
How to configure SQL Server 2005 to allow remote connections
Remote Access Settings for SQL Server

连接字符串参考：
Connection strings for SQL Server 2008

Web服务访问数据库的问题

1 个答案: