与DNN中的数据库连接失败-ConnectionToTheDatabaseFailedinDNN

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Are you trying to setup using SQL server express? In case of express version, I suggest you setup AppPool identity as ApplicationPoolIdentity and have "Load User Profile" as "True".

您是否尝试使用SQL Server express进行设置？如果是快速版本，我建议您将AppPool标识设置为ApplicationPoolIdentity，并将“加载用户配置文件”设置为“True”。

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Had the same error when I was trying to set up the website locally. Mine was due to the user identity in the Application Pool was wrong. This is what I did to solve it:

当我尝试在本地设置网站时出现同样的错误。我的应用程序池中的用户身份是错误的。这就是我解决它的方法：

1) In IIS, go to your site, click on Basic Settings, or Advanced Settings, and find the Application Pool name.

1）在IIS中，转到您的站点，单击“基本设置”或“高级设置”，然后找到“应用程序池”名称。

2) In IIS, under Application Pools tree branch on the left, select your site's Application Pool, and click on it.

2）在IIS中，在左侧的“应用程序池”树分支下，选择站点的“应用程序池”，然后单击它。

3) Click on Advanced Settings, then click on Identity. Set the account's user name and Password.

3）单击“高级设置”，然后单击“身份”。设置帐户的用户名和密码。

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Change your Application Pool Identity as NetworkService

将您的应用程序池标识更改为NetworkService

Open IIS (Run-> inetmgr) and follow the steps from screenshot below.

打开IIS（Run-> inetmgr）并按照下面的截图中的步骤操作。

IIS -> Change Application Pool Indentity for DNN Site

IIS - >更改DNN站点的应用程序池缩进